Why Correct: "Because" introduces a reason or cause, and here it correctly explains why the speaker will call later—the chores must be finished first. The sentence reads: "I will call you later because I am done with my chores."
Distractor Analysis: "Once" means "as soon as" and would imply the call happens immediately after finishing chores, but the sentence uses "later," creating a time conflict. "As" can mean "because" but also "while" or "in the manner that," making it ambiguous and less precise than "because" in this context. "So" indicates a result or consequence, but here the chores are the reason, not the result, of calling later.
Takeaway: Conjunctions like "because," "since," and "as" can all express reason, but "because" is the most direct and unambiguous choice when the cause-effect relationship is central to the sentence.

Why Correct: "Interested" takes the preposition "in" before a noun or gerund, so "interested in" is the only valid pairing. "Take up" means to begin a new activity or subject, "decided to" uses the infinitive marker "to," and "opt for" means to choose. These four collocations appear together only in the sequence in; up; to; for.
Distractor Analysis: "Interested to" is ungrammatical because "interested" requires "in" before a gerund or noun. "Take on" means to accept a responsibility or challenge, not to start learning a subject. "Opt with" does not exist; the verb "opt" always takes "for" when indicating a choice. "Interested for" and "opt in" are also incorrect because "for" does not follow "interested" and "in" does not follow "opt" in this sense.
Takeaway: Prepositional collocations are fixed: "interested in," "take up," "decided to," and "opt for" are standard in formal English. Related patterns include "good at," "fond of," and "capable of," all of which follow the same verb-preposition rule.

Why Correct: "In" denotes membership within an organization, emphasizing the internal position of an employee. Working "in" an insurance company means being part of its workforce.
Distractor Analysis: "For" indicates employment on behalf of an employer, as in "works for a company," naming the employer rather than the internal role. "At" specifies a physical location or site, such as "works at the branch office," not the organizational membership. "With" implies collaboration or partnership, as in "works with a team," rather than standard employment inside an organization.
Takeaway: "In" suits membership inside an organization, "for" names the employer, and "at" points to a workplace address; "with" signals cooperation or association.

Why Correct: The fixed collocation "control over" expresses mastery or restraint of an abstract quality such as temper, emotions, or impulses.
Distractor Analysis: "On" appears in phrases like "control on spending" or "control on prices," but it does not pair with personal attributes like temper. "With" follows "control" only in constructions such as "control with difficulty," where it modifies the manner, not the object of control. "After" has no idiomatic use with "control" in standard English; it functions as a preposition of time or sequence.
Takeaway: "Control over" governs abstract qualities (temper, emotions, impulses), while "control of" applies to concrete entities (vehicle, project, territory); examiners frequently test this distinction.

Why Correct: "On the phone" is the fixed prepositional phrase that denotes an active telephone conversation, matching the context of spending time engaged in that activity.
Distractor Analysis: "At the phone" places the subject near the device without implying any conversation. "With the phone" treats the device as a tool being held or used, not as a medium of communication. "In the phone" describes a physical location inside the device, which is impossible for a person.
Takeaway: The same preposition "on" governs broadcast media, so "on the radio" and "on TV" describe listening to or watching programmes, while "in the newspaper" and "in the magazine" describe printed content.

Why Correct: The verb "worry" takes the preposition "about" to form the standard collocation meaning to feel anxious or concerned over a specific matter. This pairing is fixed in English usage, so "about" is the only form that fits grammatically and idiomatically.
Distractor Analysis: "To" is an infinitive marker or a preposition of direction, as in "go to school," and does not follow "worry" in standard English. "With" can follow "worry" only in the sense of being troubled by a person or thing, as in "worry with a problem," but it does not convey the general sense of concern. "For" expresses concern on behalf of someone, such as "worry for you," which shifts the meaning from the object of worry to the beneficiary.
Takeaway: Common verb-preposition collocations include "care about," "talk about," and "think about," all of which use "about" to indicate the subject of mental activity.

Why Correct: 'Die of' is the standard preposition before a specific disease or internal cause of death, so 'He died of dengue' is correct.
Distractor Analysis: 'Die with' suggests accompaniment at the moment of death, not causation. 'Die from' introduces an external cause such as a wound or injury. 'Die by' indicates the means of violent death, like a weapon or suicide.
Takeaway: The same prepositional logic applies to related verbs: 'die of' for disease, 'die from' for external injury, and 'die by' for violence.

Why Correct: The preposition 'with' follows 'offended' when the target of the offense is a person, so 'offended with me' correctly expresses personal offense.
Distractor Analysis: 'At' pairs with 'offended' when the cause is an action or remark, such as 'offended at his words', not a person. 'For' signals a reason or purpose, as in 'offended for no reason', and does not mark the object of offense. 'Towards' indicates direction or attitude, like 'hostile towards me', and does not serve as the recipient of personal offense.
Takeaway: The same distinction applies to 'annoyed with' for persons and 'annoyed at' for actions, and 'angry with' for persons versus 'angry at' for situations.

Why Correct: 'By' expresses the exact amount of difference after a comparative adjective, so 'taller by two inches' correctly quantifies the height gap.
Distractor Analysis: 'With' denotes accompaniment or possession, as in 'a man with a hat', and cannot measure a difference. 'Of' signals belonging or composition, like 'a height of six feet', and does not indicate a comparative margin. 'In' marks location or inclusion, such as 'taller in the family', and fails to convey a measurable difference.
Takeaway: Comparative adjectives routinely pair with 'by' to state the margin of difference, as in 'older by five years', 'heavier by two kilograms', and 'faster by ten seconds'.

Why Correct: "Preside over" is the standard collocation meaning to chair or be in charge of a meeting, session, or assembly.
Distractor Analysis: "At" indicates a specific location or point in time, as in "preside at a ceremony"; "in" suggests being inside a place or being involved in an activity; "for" expresses purpose, duration, or benefit. None of these form the idiomatic verb-preposition pair required with "preside" when referring to a meeting.
Takeaway: "Preside over" applies to meetings, courts, and committees, while "preside at" suits formal events such as a wedding or a graduation ceremony.

Why Correct: 'One-eyed' begins with the consonant sound /w/ (as in 'wun'), so the indefinite article 'a' precedes it, making 'A one-eyed person was seen roaming about the streets' the correct sentence.
Distractor Analysis: 'An one-eyed person' uses 'an' before a consonant sound, violating the rule that 'an' appears only before vowel sounds. 'The one eyed person' lacks the hyphen in the compound adjective and uses the definite article 'the' for a general reference, which requires the indefinite article. 'One-eyed person was seen' omits the article entirely, leaving the singular count noun 'person' without the required determiner.
Takeaway: The choice between 'a' and 'an' depends on the sound that follows, not the spelling; other words beginning with a silent 'h' such as 'hour' and 'honest' take 'an' because they start with a vowel sound.

Why Correct: 'Deals in' is the standard prepositional phrase for trading or selling a specific commodity, so 'He deals in cosmetic goods' means he trades in that product line.
Distractor Analysis: 'Deals of' is not a standard English collocation for trade; 'of' typically follows 'deal' only in phrases like 'a great deal of' meaning a large amount. 'Deals with' means to handle, manage, or discuss a topic or problem, not to sell goods. 'Deals on' appears only in informal contexts like 'deals on cars' meaning bargains or discounts, not regular trading.
Takeaway: 'Deal in' applies to commodities and merchandise, while 'deal with' applies to handling situations, subjects, or people; 'deal out' means to distribute or administer, as in 'deal out cards'.

Why Correct: "By" indicates the reference point or source when asking the time displayed on a watch or clock, as in "by your watch" or "by the clock."
Distractor Analysis: "In" denotes time periods such as "in the morning" or "in 2024," not a device. "With" implies using a tool for an action, like "cut with a knife." "On" refers to specific days or dates, such as "on Monday," and does not apply to a timepiece.
Takeaway: The preposition "by" also appears in fixed expressions like "by heart" (memorized) and "by chance" (accidentally), where it conveys manner or means rather than location.

Why Correct: "Cope with" is the fixed verb-preposition collocation meaning to deal with or manage a situation, as in "cope with stress" or "cope with pressure."
Distractor Analysis: "Cope up" is not a standard English collocation; the correct form is always "cope with." "Cope in" would imply a location or context, such as "cope in a crisis," which does not fit the intended meaning. "Cope for" suggests doing something on behalf of someone, which changes the meaning entirely.
Takeaway: Other common verb-preposition collocations include "deal with," "agree to," and "depend on," each requiring a specific preposition that cannot be interchanged.

Why Correct: "In the shade" is the standard idiomatic phrase in English for a location shielded from direct sunlight, so "in" is the correct preposition.
Distractor Analysis: "Under the shade" and "below the shade" are grammatically possible but non-idiomatic; English speakers use "in the shade" for this stationary location. "Through the shade" implies movement across a shaded area, not a fixed position.
Takeaway: The preposition "in" pairs with "shade" to denote location, while "shade from" indicates protection against a source (e.g., shade from the sun) and "shade of" specifies the object casting it (e.g., shade of a tree).

Why Correct: The fixed collocation "made the most of" means to utilize something to its maximum advantage, and "of" is the only preposition that completes this idiomatic phrase.
Distractor Analysis: "At" does not combine with "made the most" to form any standard English expression. "From" appears in constructions like "made from materials," which indicates the source or origin of a manufactured item, not optimal utilization. "With" can follow "made" in phrases such as "made with care," but it does not fit the idiomatic structure that conveys extracting full benefit.
Takeaway: The collocation "make the most of" belongs to a set of fixed prepositional phrases that include "make use of," "take advantage of," and "get rid of," all of which require the preposition "of" after their key noun.

Why Correct: The verb "prefer" takes the preposition "to" when comparing two alternatives, so "prefer classical music to popular numbers" is the grammatically accepted construction.
Distractor Analysis: "From" indicates a point of origin or source, as in "music from the 1980s." "Of" expresses possession or belonging, such as "the music of Beethoven." "Over" appears in informal speech, but standard English requires "to" after "prefer" in comparative contexts.
Takeaway: The pattern "prefer X to Y" mirrors other fixed prepositional pairs like "compare X with Y" and "substitute X for Y," all of which examiners test to check mastery of idiomatic preposition use.

Why Correct: The standard English collocation is 'preference for X over Y', where 'for' introduces the preferred item and 'over' introduces the item being compared against; 'for, over' fits this pattern.
Distractor Analysis: 'over, for' reverses the required order, placing 'over' before the preferred item and 'for' before the comparison item, which is non-idiomatic. 'for, to' uses 'to' for the second preposition, but 'to' does not express the comparative sense of 'over' in this construction. 'to, over' uses 'to' for the first preposition, but 'preference to' is not standard; the correct first preposition is 'for'.
Takeaway: Other fixed prepositional collocations include 'compare X with Y' (or 'compare X to Y' for likeness), 'differ from', and 'similar to'; these patterns are frequently tested in error-spotting questions.

Why Correct: "By my watch" means "according to my watch," using "by" to indicate the standard or measure by which time is judged.
Distractor Analysis: "In my watch" would mean physically inside the watch, which is not idiomatic for time. "At my watch" suggests a point location, not a measurement standard. "Into my watch" implies movement toward the inside, which is irrelevant to telling time.
Takeaway: "By" also appears in phrases like "by the clock" and "by the calendar," where it consistently marks the reference standard for measurement.

Why Correct: The fixed prepositional phrase "short of" expresses a deficiency or lack, so "running short of time" means having insufficient time remaining.
Distractor Analysis: "At" points to a specific location or moment, as in "at noon" or "at the station." "With" signals accompaniment or possession, such as "with a friend" or "with a book." "For" indicates purpose, duration, or destination, like "for an hour" or "for the meeting." These alternatives do not convey the sense of scarcity that "of" provides in this idiom.
Takeaway: The preposition "of" follows "short" whenever the meaning is deficiency, as in "short of cash," "short of breath," or "short of patience."

Why Correct: The preposition "from" follows "save" to indicate the danger or harm from which someone is rescued, so "saved her from certain death" is the idiomatic construction.
Distractor Analysis: "With" indicates the means or instrument used, as in "saved her with a rope," not the danger avoided. "Of" expresses possession or a quality, as in "a man of courage," and does not follow "save" in this context. "In" indicates location or state, as in "in danger," but does not convey the sense of rescue from a threat.
Takeaway: The pattern "save + object + from + danger" is a fixed collocation; other verbs that take "from" after them include "protect," "rescue," and "shield."

Why Correct: "Prevail upon" is the standard phrasal verb meaning to persuade someone to do something, and it fits the sentence structure "prevailed _____ him to join."
Distractor Analysis: "On" also appears in the phrase "prevail on," which is a variant with the same meaning, but "upon" is the more formal and preferred choice in this collocation. "Beside" means next to or alongside, not persuasion. "Along with" means together with, not persuasion.
Takeaway: The verb "prevail" also appears in the phrase "prevail over," meaning to triumph against an opponent or obstacle, as in "justice prevailed over tyranny."

Why Correct: "On board" is the standard idiomatic phrase meaning present on a ship, and it correctly combines with the verb "were" and the duration "for a month" to form "were on board the ship."
Distractor Analysis: "Aboard" also means on a ship, but it typically functions as an adverb or preposition without a following noun phrase like "the ship," so "aboard the ship" would be redundant. "On" alone is too vague and does not convey the specific sense of being on a vessel. "Off" means away from the ship, the opposite of the intended meaning.
Takeaway: "Aboard" and "on board" are interchangeable when used adverbially, as in "The passengers came aboard" or "The passengers came on board," but "on board" is preferred before a noun phrase such as "the ship" or "the aircraft."

Why Correct: The verb 'hint' takes the preposition 'at' to form the fixed collocation 'hint at', meaning to mention something indirectly or suggest it without stating it directly. In this sentence, 'hinted at some lost treasure' conveys that he made an indirect reference to a treasure that was lost.
Distractor Analysis: 'Hint of' appears in phrases like 'a hint of spice' where it means a slight trace or suggestion of a quality, not the object of a hinting action. 'Hint for' would imply a clue or suggestion intended to help someone achieve something, such as 'a hint for solving the puzzle'. 'Hint with' is not a standard English collocation; 'with' does not follow 'hint' in any common usage.
Takeaway: Fixed verb-preposition pairs such as 'hint at', 'insist on', 'comply with', and 'accuse of' are frequently tested in competitive exams; these collocations must be learned as whole units because their meanings cannot be derived from the individual words.

Why Correct: The verb phrase 'ask for' requires the preposition 'for', so the second blank must be 'for'. In a restrictive clause that identifies a specific watch, 'that' is the preferred relative pronoun, making 'that, for' the correct combination.
Distractor Analysis: 'Which' can introduce a restrictive clause but is more common in non-restrictive clauses, so it is less appropriate here. 'For, from' uses the wrong preposition after 'asked' — 'ask from' is not standard English. 'This, for' fails because 'this' is a demonstrative pronoun, not a relative pronoun, and cannot connect the clause 'you asked for' to 'watch'.
Takeaway: 'That' introduces restrictive clauses that are essential to the meaning of the sentence, while 'which' typically introduces non-restrictive clauses set off by commas. The verb 'ask' pairs with 'for' when requesting an object, but 'ask of' or 'ask from' appear in different constructions, such as 'ask a favour of someone'.

Why Correct: The fixed prepositional phrase for being engaged in a telephone conversation is 'on the phone'.
Distractor Analysis: 'At the phone' indicates physical proximity to a telephone device, not an active call. 'In the phone' does not form a standard idiomatic expression in English. 'To the phone' requires a verb of motion such as 'go' or 'come' to indicate direction toward the device.
Takeaway: Other telephone-related collocations include 'by the phone' (near the device) and 'over the phone' (via a telephone conversation).

Why Correct: The preposition 'at' follows 'alarmed' to indicate the cause or source of the alarm, forming the standard collocation 'alarmed at'. This construction appears in formal and informal English alike, as in 'alarmed at the rising crime rate'.
Distractor Analysis: 'In' indicates location, time, or state (e.g., 'in the room', 'in the morning'), and does not pair with 'alarmed' to show cause. 'To' indicates direction, purpose, or attachment (e.g., 'go to school', 'to the point'), and does not form a valid collocation with 'alarmed'. 'Away' is an adverb meaning 'at a distance' or 'in another direction', not a preposition, so it cannot follow 'alarmed' in this context.
Takeaway: Adjectives expressing emotional reactions commonly take 'at' to introduce the stimulus, including 'surprised at', 'shocked at', 'annoyed at', and 'delighted at'.

Why Correct: The noun 'desire' takes the preposition 'for' to indicate the object of longing, as in 'desire for fame'.
Distractor Analysis: 'Of' indicates possession or origin, 'in' suggests location or inclusion, and 'to' is used before verbs or as part of infinitive phrases, not after 'desire' when followed by a noun.
Takeaway: Common noun-preposition collocations include 'interest in', 'fear of', 'objection to', and 'desire for'.

Why Correct: "Exception to" is the fixed prepositional collocation; it signals that a rule does not apply in a specific case.
Distractor Analysis: "Exception for" grants an exemption to a person or entity, not to a rule. "Exception in" locates an exception within a document or context, such as an exception in a contract. "Exception up" does not form a standard English collocation.
Takeaway: The pattern "exception to the rule" is idiomatic; parallel fixed collocations include "key to" and "solution to".

Why Correct: "On" precedes specific days such as Monday, and "on tour" is a fixed prepositional phrase meaning travelling for performances or work.
Distractor Analysis: "Of tour" is ungrammatical because "of" does not combine with "tour" in this sense. "In Monday" is incorrect because "in" applies to months, years, and periods, not individual days. "Of Monday" is also ungrammatical; "of" indicates possession or origin, not time.
Takeaway: "On" also appears in fixed phrases like "on business", "on duty", and "on holiday", while "in" governs months, years, and seasons.

Why Correct: The verb "sympathize" takes the preposition "with" when expressing shared feeling toward a person, so "He sympathized with him in his bereavement" is the correct construction.
Distractor Analysis: "In" indicates location or time, not shared feeling. "For" often shows cause or purpose, as in "sympathize for a cause." "By" indicates the agent in passive constructions.
Takeaway: The preposition "with" also follows "agree," "disagree," and "concur" when they express alignment or shared opinion with a person.

Why Correct: The adjective "weak" pairs with the preposition "in" when referring to a field or academic subject, so "weak in study" correctly parallels "proficient in music."
Distractor Analysis: "Weak at" applies to specific skills or activities, such as "weak at swimming," not to academic subjects. "Weak with" and "weak on" are non-standard collocations in this context; "with" indicates accompaniment or instrument, and "on" indicates a surface or topic, neither of which fits the intended meaning of deficiency in a subject.
Takeaway: The preposition "in" follows adjectives denoting proficiency or deficiency in a domain, such as "strong in mathematics" and "deficient in vocabulary," while "at" pairs with skill-based activities like "good at chess."

Why Correct: The preposition "to" forms the fixed collocation "true to," meaning loyal or faithful to a promise or standard. A gentleman who is true to his words consistently keeps the promises he makes.
Distractor Analysis: "From" indicates a source or origin, so "true from" would suggest deriving truth from something, which does not fit the meaning of keeping promises. "In" denotes a location or domain, and "true in" could mean accurate within a particular field, but it does not convey faithfulness to one's commitments. "On" typically indicates a surface or basis, and "true on" lacks idiomatic usage in English, making it an invalid choice.
Takeaway: The collocation "true to" also appears in expressions such as "true to form," meaning behaving in a predictable way, and "true to oneself," meaning acting in accordance with one's own values or principles.

Why Correct: "Vexed with" is the standard prepositional collocation when annoyance is directed at a person, so "with" correctly completes the sentence.
Distractor Analysis: "Vexed about" applies to situations, topics, or issues rather than people. "Vexed to" is not idiomatic because "to" does not follow "vexed" in standard usage. "Vexed in" is also non-idiomatic; "in" would indicate location or state, not the object of annoyance.
Takeaway: Adjectives expressing anger or annoyance, such as "annoyed," "irritated," and "angry," take "with" for the person and "about" for the issue, while "at" also appears with "angry" in some contexts.

Why Correct: "Compare to" is the correct collocation when the comparison highlights a similarity between two essentially different things, as in a poetic simile where the lady is likened to the moon for beauty.
Distractor Analysis: "Compare with" is used when examining both similarities and differences between two items of the same class, such as comparing two smartphones. "Of" never follows "compared" in standard English usage. "Like" would require a different sentence structure, such as "The lady is like the moon," because "compared like" is not grammatically valid.
Takeaway: "Compare to" pairs with nouns of different categories for figurative likeness, while "compare with" pairs with nouns of the same category for analytical evaluation; "compared to" also appears in the simile structure "as compared to" for statistical contrasts.

Why Correct: "Around the globe" is the standard fixed phrase meaning worldwide, indicating that competitors came from all parts of the world.
Distractor Analysis: "From the globe" would imply extraction from the planet itself, not participation from different locations. "Over the globe" is non-idiomatic; the correct phrase for that meaning is "all over the world." "Across the globe" is also idiomatic and means worldwide, but "around" is the most common and the given correct answer.
Takeaway: "Around the globe" and "across the globe" both mean worldwide, while "all over the world" is the equivalent phrase with "world"; "throughout the globe" is another acceptable variant.

Why Correct: The adjective "angry" takes the preposition "with" when the object of anger is a person, so "angry with the subordinates" is the idiomatic construction.
Distractor Analysis: "Upon" and "on" indicate position or surface and never follow "angry" in this sense. "Against" pairs with the noun "anger" (anger against someone) but not with the adjective "angry."
Takeaway: The same adjective takes "at" when the object is a thing or situation, as in "angry at the delay," and "about" when referring to a topic, as in "angry about the decision."

Why Correct: The noun "hatred" takes the preposition "for" when the object is a person, so "hatred for Antonio" is the standard collocation.
Distractor Analysis: "To" does not follow "hatred" in standard usage; "against" appears with the verb "bear" (bear hatred against) but not with the noun alone; "about" introduces a topic or subject, not the target of hatred.
Takeaway: Related emotion nouns follow fixed prepositions: "love for," "respect for," "anger at," and "hatred for/of" — each pairs with a specific preposition that examiners test.

Why Correct: "At" marks a specific point or location, so "at the door" places the woman precisely at the entrance as a point of reference.
Distractor Analysis: "By" means beside or near, but it is less precise than "at" and does not convey the exact point of the door. "On" would place the woman on top of the door, which is physically impossible in this context. "In" would place her inside the door's structure, such as within the doorway or the door itself, not at the entrance.
Takeaway: Prepositions of place follow a hierarchy: "at" for a specific point, "on" for a surface, "in" for an enclosed space, and "by" for proximity; this distinction is frequently tested in exams.

Why Correct: A tunnel is an enclosed passage, and the train moves from one end to the other, so the preposition that denotes movement inside such a space is "through".
Distractor Analysis: "Under" places the train beneath a surface, such as a bridge or an overpass, not inside a tunnel. "In" describes a static location, like a train standing inside a station, and does not convey motion. "By" indicates passing alongside or near something, such as a train passing by a signal post, not entering an enclosed structure.
Takeaway: Prepositions of movement pair with specific spatial relationships: "through" for enclosed spaces, "across" for surfaces, and "along" for lines.

Why Correct: The adjective 'indispensable' idiomatically pairs with the preposition 'to' to mean absolutely necessary for something, so 'indispensable to success' is the correct collocation.
Distractor Analysis: 'For' commonly indicates purpose or benefit, as in 'necessary for success', but it does not pair with 'indispensable'. 'At' indicates location, time, or skill, such as 'good at mathematics'. 'In' indicates inclusion, location, or time frame, as in 'in the morning'.
Takeaway: Other adjectives that take 'to' include 'accustomed to', 'devoted to', and 'committed to', whereas 'necessary' and 'essential' typically take 'for'.

Why Correct: 'Smile on' is a fixed phrasal verb meaning to favour or bless, so 'Fortune smiled on his efforts' conveys that his efforts met with success.
Distractor Analysis: 'Smile at' refers to directing a facial expression toward someone, not to fortune's favour; 'smile over' does not form a standard phrasal verb in this sense; 'smile for' appears in contexts like posing for a photograph or smiling for a reason.
Takeaway: 'Smile on/upon' is the idiomatic collocation for favour or approval, and 'smile at' is the correct choice when referring to a literal facial expression directed at a person.

Why Correct: 'Subversive of' is the standard idiomatic collocation meaning tending to undermine or corrupt, so 'Your conduct is subversive of all discipline' is correct.
Distractor Analysis: 'Subversive to' is occasionally used but not the preferred collocation; 'subversive with' and 'subversive for' are simply unidiomatic.
Takeaway: 'Subversive' takes the preposition 'of' (similar to 'destructive of' or 'regardless of').

Why Correct: The verb "confide" takes the preposition "in" when the meaning is to trust someone with private or secret matters, so "confide in" is the standard collocation.
Distractor Analysis: "Confide on" does not exist in standard English; the verb does not pair with "on" for this sense. "Confide upon" is archaic and rarely appears in modern usage. "Confide with" is also nonstandard; the correct structures are "confide in someone" and "confide something to someone."
Takeaway: The verb "confide" also appears in the phrasal form "confide in" meaning to share secrets, while "confide something to someone" means to entrust information to a person.

Why Correct: The adjective "enamoured" takes the fixed preposition "of" to indicate the object of admiration, as in "enamoured of the subject."
Distractor Analysis: "With" is a common but non-standard preposition in this context; standard usage prefers "of." "By" would suggest the subject is the agent causing the admiration, which is not the intended meaning. "For" is ungrammatical with "enamoured" and does not form a standard collocation.
Takeaway: Other adjectives that take fixed prepositions include "fond of," "aware of," and "capable of," all of which use "of" to link the adjective to its object.

Why Correct: 'Agree to' is the standard collocation for accepting a proposal, plan, or suggestion, so 'to' is the correct preposition.
Distractor Analysis: 'With' pairs with 'agree' when the object is a person or an opinion, as in 'agree with the speaker'. 'At' does not form a standard collocation with 'agree' in this sense. 'For' appears in constructions like 'agree for a price' but not when the object is a proposal.
Takeaway: 'Agree on' applies when two or more parties reach a mutual decision about a specific point, as in 'agree on a date'.

Why Correct: 'Proficient in' is the fixed prepositional collocation that indicates skill in a particular field or activity, so 'in' is correct.
Distractor Analysis: 'For' expresses purpose or destination, as in 'trained for a competition'. 'At' marks a point in space or time, or appears in phrases like 'good at cooking' but not with 'proficient'. 'With' indicates an instrument or accompaniment, as in 'write with a pen'.
Takeaway: 'Skilled in' and 'expert at' are related collocations; 'expert in' also works, but 'expert at' is more common when followed by a gerund.

Why Correct: The verb "subsist" takes the fixed preposition "on" to indicate the means of sustenance, so "subsist on" means survive by eating.
Distractor Analysis: "Subsist in" would mean exist within, which does not fit the context of food. "Upon" is grammatically possible but archaic; modern usage prefers "on" for this verb. "Because of" introduces a reason or cause, not the means of sustenance.
Takeaway: Verbs with fixed prepositional partners include "subsist on", "live on", and "feed on"; "subsist" never takes "in" or "because of" in standard usage.

Why Correct: The preposition "from" pairs with "derived" to signal the source or origin of income. Rent is income obtained through land ownership, so "derived from the ownership of lands" expresses that source relationship.
Distractor Analysis: "With" would imply accompaniment, as in "derived with effort," not origin. "For" indicates purpose or reason, such as "derived for the benefit of," which does not fit the source meaning. "Under" suggests subordination or conditions, like "derived under a contract," which does not convey the idea of income arising from ownership.
Takeaway: Common verb-preposition collocations include "derive from," "differ from," "abstain from," and "prohibit from," all using "from" to indicate source or separation.

Why Correct: The adjective "contemporary" takes the preposition "of" to indicate that Patanjali and Pushyamitra Sungo lived during the same period.
Distractor Analysis: "To" after "contemporary" appears in some non-standard usages but lacks idiomatic acceptance. "With" occasionally appears in informal writing, yet "of" remains the preferred choice in formal English. "In" would suggest being contemporary within a particular context or field, not coexistence in time.
Takeaway: In English, several adjectives of relation take "of" — "contemporary of," "contemporaneous with," and "simultaneous with" — but "contemporary" specifically governs "of" when referring to a person's lifetime.

Why Correct: The preposition "with" forms the standard collocation "popular with," meaning liked or admired by a specific group, as in "popular with his pupils."
Distractor Analysis: "Among" can indicate being liked within a larger, less defined group, but it is less idiomatic when the group is a specific body such as pupils. "To" does not form a standard collocation with "popular" in this sense; "popular to" is non-standard. "For" introduces a reason or cause, as in "popular for his kindness," not the group that holds the opinion.
Takeaway: The preposition "with" also follows adjectives such as "familiar," "consistent," and "satisfied," while "among" typically appears with plural or collective nouns to indicate distribution within a group.

Why Correct: The fixed prepositional phrase "in the face" pairs with "look" to mean direct, bold confrontation, so "in" is the only idiomatic choice.
Distractor Analysis: "At" indicates direction of gaze but not the confrontational sense of the idiom. "To" does not form any standard English collocation with "look ... the face." "On" appears in phrases like "a look on his face" to describe an expression, not direct eye contact.
Takeaway: Other fixed prepositional idioms with body parts include "look someone in the eye," "hit someone in the arm," and "stare someone in the face," all using "in" for direct contact or confrontation.