Option 2 is correct because “incorruptible” means free from corruption, making dishonest its opposite.

Option 1 is correct because a teacher’s core function is to educate, just as a senator’s is to represent.

Option 4 is correct because weakness is the absence of strength, just as being lost is the absence of direction.

Option 1 is correct because “clandestine” means kept secret or done secretively.

Option 2 is correct because a benefactor is a person who gives money or other help to a person or cause (a donor).

Option 2 is correct because “exuberant” means full of energy and excitement, making sad its opposite.

Option 2 is correct because “amicable” means characterized by friendliness without serious disagreement, making hostile its opposite.

Option 2 is correct because an ongoing past action interrupted by another requires the past continuous/progressive sequence “had been going on”.

 Option 4 is correct as the passive voice with “impressed” takes the preposition “by”.

Option 3 is correct because “terse” means sparing in the use of words; abrupt/brief.

Option 4 is correct because gold inherently implies high value/expense, matching velvet’s intrinsic softness.

Option 3 is correct because “serenity” means the state of being calm, peaceful, and untroubled (peace).

Option 3 is correct because with “Neither… nor”, the verb agrees with the closer subject (“students”), requiring the plural “were”.

Option 3 is correct because the phrase “get used to” is followed by a gerund (“drinking”).

 Option 2 is correct because lack of fame mirrors being unknown, just as lack of education mirrors being ignorant.

Option 4 is correct because a helicopter operates in the sky, just as a submarine operates in water.

Option 2 is correct because “mundane” means lacking interest or excitement; dull, making exciting its opposite.

Option 1 is correct because the standard idiomatic expression for checking a timepiece is “by your watch”.

Option 2 is correct because “tedious” means too long, slow, or dull, making interesting its opposite.

Option 1 is correct because “discreet” means careful and circumspect in one’s speech or actions, making careless its opposite.

Option 3 is correct because the singular subject “policy” requires the singular verb “aims”.

Option 2 is correct because consistent practice and unwavering determination logically lead to victory.

Option 2 is correct because being cautious in decisions and humble in behavior represent balanced professional traits.

Option 2 is correct because “loquacious” means talkative, making quiet its antonym.

Option 2 is correct because “diligent” means having or showing care and conscientiousness (careful).

Option 1 is correct because initial perfection contrasting with hidden flaws creates logical coherence (“perfect… hidden”).

Option 1 is correct because “nevertheless” properly connects a calm tone with the delivery of a warning.

Option 3 is correct because “reprehensible” means deserving censure or condemnation (blameworthy).

Option 2 is correct because a suit is formally worn, just as a coat is warmly worn.

Option 2 is correct because a lap is a subdivision of a race, just as an act is a subdivision of a play.

Option 2 is correct because “liberation” means the action of setting someone free, making captivity its opposite.

Option 1 is correct because nice and unkind are antonyms, matching hideous and pretty.

Option 2 is correct because harsh weather paired with high spirits forms a standard contrast in narrative contexts.

Option 2 is correct because third conditional past events require the structure “had been announced… might have made”.

Option 2 is correct because “tenacity” means persistence, making weakness its antonym.

Option 1 is correct because “incisive” means analytically acute and clear-cut (sharp).

Option 2 is correct because “veracious” means speaking or representing the truth, making false its opposite.

Option 1 is correct because mixed reviews initially contrast with a huge success later.

Option 3 is correct because a mother is inherently female, just as a rock is inherently hard.

Option 1 is correct because the adjective “complete” modifies the noun “surprise”.

Option 2 is correct because “valiant” means possessing or showing courage or determination (brave).

Option 3 is correct because “eloquence” is fluent or persuasive speaking or writing (persuasiveness).

Option 1 is correct because future plans take the present simple “plans… is” in conditional time clauses.

Option 2 is correct because “adamant” means refusing to be persuaded or to change one’s mind (stubborn).

Option 2 is correct because a mountain is defined by being high, just as a valley is defined by being low.