‘Fawn’ in the first blank means a light brown colour, whereas ‘fawn’ in the second blank means a young deer in its first year. ‘Reminisced’ in the third blank means indulged in enjoyable recollection of past events. The first and the second blank call for a word that means different in different context, hence 'reminisce' fits here correctly.

The other words mean: 
‘Nostalgic’ means feeling, evoking, or characterized by nostalgia
‘Meadow’ means a piece of grassland, especially one used for hay
‘Tainted’ means affect with a bad or undesirable quality
‘Crux’ means the decisive or most important point at issue
‘Eclectic’ means deriving ideas, style, or taste from a broad and diverse range of sources.

‘Jam’ in the first blank means an awkward situation or predicament, whereas ‘jam’ in the second blank means squeeze or pack tightly into a specified space. ‘Akin’ in the third blank means something of a similar character. The first and the second blank call for a word that means different in different context, hence 'jam' fits here correctly. The phrase "what they did last time" indicates that "akin" can be used in the third blank.

The other words mean:
‘Ram’ means roughly force (something) into place
‘Substitute’ means to use or add in place of
‘Assuage’ means make (an unpleasant feeling) less intense
‘Comprehend’ means grasp mentally; understand
'Compile' means assemble

Because of the article ‘an’ before the first blank, option A and option B can’t be used.
Option C) The accelerator is also known as the gas pedal. It is the pedal located on the floor on the far-right. This pedal controls the amount of gas being fed into the engine and thereby controls the speed of the vehicle. Disregarded makes no sense in the context of the sentence.
Option D) An amphibious vehicle is a vehicle that is a means of transport, viable on land as well as on water. Amphibious vehicles include amphibious bicycles, ATVs, cars, buses, trucks, military vehicles, boats and hovercraft. A structural engineer is a person who is specially trained to examine buildings and discover if there are any problems with their structure
Option E) A utility vehicle is a vehicle, generally motorized, that is designed to carry out a specific task with more efficacy than a passenger vehicle. An electronics engineer is a trained expert in electrical systems, especially systems that power and control machines or are involved in communication. Because of ‘mechanics,’ this option becomes inappropriate for the third blank.
Therefore, option D is the apt answer.

A towing vessel is a multi-purpose boat used by state authorities to tow disabled vessels on high seas in order to prevent dangers to man and environment. A pier is a platform sticking out into the water, usually the sea, which people walk along or use when getting onto or off boats. Allision is the action of dashing against or striking upon. It also refers to the running of one ship upon another ship that is stationary —distinguished from the collision. The most preferable word in the first and the second blank should mean ‘boat/ship’ and the word in the third blank should mean ‘damaged.’
Option A) A barge is a flat-bottomed ship, built mainly for river and canal transport of heavy goods. Destroyed means to end the existence of something by damaging or attacking it.
Option B) A tower is a tall, narrow building, that either stands alone or forms part of another building. This seems inappropriate in the context of the sentence.
Option C) Obelisk is a tall, four-sided, narrow, tapering monument which ends in a pyramid-like shape or pyramidion at the top. Also, renewed is the complete opposite of the word we need in the third blank. Thus, this option can’t be used.
Option D) Wherry is a light rowing boat used chiefly for carrying passengers. But, we need a plural noun to make the sentence grammatically correct. Thus. This option can’t be used.
Option E) Restored is the complete opposite of the word we need in the third blank. Thus, this option can’t be used.
Therefore, option A is the apt answer.

Option A) The word ‘sew’ only fits in the first blank, not in the second blank. Hence, this option can’t be used.
Option B) Baste means to pour fat or juices over meat during cooking in order to keep it moist. Baste also means to sew with long, loose stitches, as in temporarily tacking together pieces of a garment while it is being made. Perfectly means extremely well; flawlessly.
Option C) The word ‘pour’ only fits in the second blank, not in the first blank. Hence, this option can’t be used.
Option D) The word ‘cook’ only fits in the second blank, not in the first blank. Hence, this option can’t be used.
Option E) Tack means to fasten pieces of cloth together temporarily with long stitches. It also means to add or append something to something already existing. So, it can be used in the first and the second blank. Erratically is an adverb which means in a manner that is not even or regular in pattern or movement. So, this does not fit in the context of the sentence.
Therefore, option B is the apt answer.

The meaning of the words are as follows:

Grace: smoothness and elegance of movement.

Regular: arranged in or constituting a constant or definite pattern, especially with the same space between individual instances.

Normal: conforming to a standard; usual, typical, or expected.

Deviant: departing from usual or accepted standards, especially in social or sexual behaviour.

Spasmodic: pertaining to or of the nature of a spasm; characterized by spasms.

Bodily: corporeal or material, as contrasted with spiritual or mental.

Spiritual: of or relating to the spirit or soul, as distinguished from the physical nature.

Recurrent: that recurs; occurring or appearing again, especially repeatedly or periodically.

Equivocal: of uncertain significance; not determined.

Fineness: marked by or affecting elegance or refinement.

Poise: graceful and elegant bearing in a person.

Therefore, it can be observed that option E i.e. ‘fineness, poise' forms a synonym- synonym pair of ‘grace'. Hence, the correct answer is E.

The meaning of the words are as follows:

Supportive: give approval, comfort, or encouragement to.

Confuting: to prove (a person) to be wrong by argument or proof.

Refuting: to prove to be false or erroneous, as an opinion or charge.

Unnerving: to deprive of courage, strength, determination, or confidence; upset.

Fervour: great warmth and earnestness of feeling.

Regret: to feel sorrow or remorse for (an act, fault, disappointment, etc.).

Rigid: stiff or unyielding; not pliant or flexible.

Sociable: inclined to associate with or be in the company of others.

Apathy: absence or suppression of passion, emotion, or excitement.

Consonance: accord or agreement.

Harmony: agreement; accord; harmonious relations.

Therefore, it can be observed that option A i.e. ‘confuting, refuting' forms an antonym-antonym pair of ‘Supportive'. Hence, the correct answer is A.

The meaning of the words are as follows:
Idealistic: modelled on or aiming for a state in which everything is perfect.
Lofty: of imposing height.
Bathetic: producing an unintentional effect of anti-climax.
Hopeful: feeling or inspiring optimism about a future event.
Intangible: unable to be touched; not having a physical presence.
Assured: protected against discontinuance or change.
Bright: cheerful and lively.
Pragmatic: of or relating to a practical point of view or practical considerations.
Quixotic: extremely idealistic; unrealistic and impractical.
Maudlin: self-pityingly or tearfully sentimental.
Mawkish: sentimental in an exaggerated or false way.
Therefore, it can be observed that option D i.e. ‘pragmatic, quixotic' forms an antonym- synonym pair of ‘idealistic'. Hence, the correct answer is D.

The meaning of the words are as follows:
Vital: necessary to the existence, continuance, or well-being of something; indispensable; essential.
Evanesce: to disappear gradually; vanish; fade away.
Pertinent: pertaining or relating directly and significantly to the matter at hand; relevant.
Critical: inclined to find fault or to judge with severity, often too readily.
Atomic: of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs.
Sterile: free from living germs or microorganisms; aseptic.
Vanity: excessively proud of or concerned about one's own appearance, qualities, achievements, etc.
Prosaic: commonplace or dull; matter-of-fact or unimaginative
Vapid: lacking or having lost life, sharpness, or flavour; insipid; flat.
Petty: of lesser or secondary importance, merit, etc.
Frivolous: of little or no weight, worth, or importance; not worthy of serious notice.
Therefore, it can be observed that option E i.e. ‘petty, frivolous' forms an antonym-antonym pair of ‘vital'. Hence, the correct answer is E.

The meaning of the words are as follows:
Underlying: implicit; discoverable only by close scrutiny or analysis.
Basal: forming or belonging to a bottom layer or base.
Connate: entrapped in sediments at the time of their deposition.
Prime: the state or time of greatest vigour or success in a person's life.
Intrinsic: belonging naturally; essential.
Latent: (of a quality or state) existing but not yet developed or manifest; hidden or concealed.
Quiescent: in a state or period of inactivity or dormancy.
Paramount: more important than anything else; supreme.
Element: an essential or characteristic part of something abstract.
Veiled: covered or concealed by, or as if by, a veil.
Dormant: in a state of rest or inactivity; inoperative; in abeyance.
Therefore, it can be observed that option C i.e. ‘latent, quiescent' forms a synonym-synonym pair of ‘underlying'. Hence, the correct answer is C.