'Complacent' means showing smug or uncritical satisfaction with oneself or one's achievements. Dissatisfied means not content or happy with something. These are exact opposites making option 1 the right answer.

'Impressed’ means to make (someone) feel admiration and respect, 'Attracted' means cause (someone) to have a liking for or interest in something and 'Kind' means generous and helpful.

The meaning of the given words is:

Sloth: lazy or inactive

Lazy: inactive

Vigorous: active

Stout: robust

Reckless: rash

Hence, option 1 is the correct answer.

The meaning of given words is:

Interject: say (something) abruptly, especially as an aside or interruption

Interpose: say (words) as an interruption

Audacious: showing a willingness to take surprisingly

Garland: wreath of flowers or leaves

Aberrant: deviating from moral path

Hence, option 1 is the correct answer.

The correct answer is option 2.

'Prefer' is always followed by the preposition 'to'. Therefore, the correct sentence will be:

I prefer tea to coffee.

The correct answer is option 2.

The meaning of the verb cope is to manage. 'Cope' is always followed by the preposition 'with'. Therefore, the sentence will be:

He cannot cope with this pressure.

The correct answer is option 3.

The helping verb 'did' is always followed by the present tense of the verb. Therefore, the correct sentence will be: She did not submit the assignment last week.

The answer is option (4) i.e. No Error because the sentence seems grammatically correct.

The above statement is in the past perfect tense. A past perfect tense indicates an action that was completed at some point in the past before something else happened.

Similarly, the above statement expresses that they planned to stay overnight at the hotel but they could not since they did not have a room reserved in advance.

The past perfect tense helps us in differentiating between two events that both happened in the past. The phrase 'has not' is used for a present perfect tense and the phrase 'will not' is used for expressing something in the future.

Thus, option 1, i.e. had not is the correct answer as it perfectly describes the past perfect tense.

Let’s understand the meaning of the given options

Toxicology: the branch of science concerned with the nature, effects, and detection of poisons

Aerostatics: study of ballooning

Sericulture: the production of silk and the rearing of silkworms for this purpose

Agronomy: is the science and technology of producing and using plants for food, fuel, fiber, and land reclamation

Therefore, the correct answer is option 2 i.e. Aerostatics.

Let’s understand the meaning of the given options

Realist: a person who accepts a situation as it is and is prepared to deal with it accordingly

Atheist: a person who disbelieves or lacks belief in the existence of God or gods

Ascetic: characterized by severe self-discipline and abstention from all forms of indulgence, typically for religious reasons

Pragmatist: a person who is guided more by practical considerations than by ideals

Therefore, the correct answer is option 4 i.e. Pragmatist.