Meaning: To 'suggest' means to propose or indicate something as a possibility or recommendation.

Wrong options:

• declared: The verb 'declared' implies a strong statement or announcement, which does not fit the context of research findings that typically indicate possibilities rather than certainties.
• definitely: 'Definitely' is an adverb that expresses certainty, but it does not serve as a verb and cannot fit grammatically in this context.
• asserted: 'Asserted' suggests a strong claim or declaration, which is too definitive for the context of research findings that typically suggest rather than assert.

Correct answer: are likely to

Explanation: The phrase 'are likely to' indicates a probability or expectation about the future, which fits the context of discussing trends in drug popularity. It maintains grammatical consistency with the subject 'drugs' and the future tense implied in the sentence.

Meaning: 'Are likely to' means that something is expected or probable to happen.

Wrong options:

• are likely to: This option is repeated and is the correct answer, so it does not apply as a wrong option.
• definitely: 'Definitely' does not fit grammatically as it is an adverb and does not indicate a future possibility.
• claimed: 'Claimed' is in the past tense and does not fit the future context of the sentence.

Correct answer: claimed

Explanation: The verb 'claimed' is in the past tense, which is appropriate here as it refers to a past opinion poll. It fits grammatically as it describes what people reported in the poll.

Meaning: To 'claim' means to state or assert something, often without providing evidence.

Wrong options:

• declared: 'Declared' implies a formal announcement, which does not accurately reflect the informal nature of the opinion poll.
• definitely: 'Definitely' is an adverb and does not serve as a verb, making it grammatically incorrect in this context.
• suggests: 'Suggests' is in the present tense and does not fit the past context of the poll.

Correct answer: suggests

Explanation: The verb 'suggests' is again in the present tense, which is appropriate as it indicates the ongoing opinion of the scientist regarding ethical responsibility. It fits grammatically as it serves as the main verb in this clause.

Meaning: To 'suggest' means to propose an idea or indicate a possibility.

Wrong options:

• declared: 'Declared' implies a strong statement, which does not fit the context of a suggestion about ethical responsibility.
• definitely: 'Definitely' is an adverb and does not serve as a verb, making it grammatically incorrect here.
• asserted: 'Asserted' suggests a strong claim, which is too definitive for the context of ethical suggestions.

Correct answer: suggests

Explanation: The verb 'suggests' is in the present tense, which aligns with the ongoing implications of the research findings regarding new laws. It fits grammatically as it serves as the main verb of the sentence, indicating what the research implies about future regulations.

Meaning: To 'suggest' means to propose or indicate something as a possibility or recommendation.

Wrong options:

• declared: 'Declared' implies a strong statement or announcement, which does not fit the context of suggesting new laws.
• definitely: 'Definitely' is an adverb that expresses certainty, but it does not serve as a verb in this context.
• asserted: 'Asserted' suggests a strong claim or declaration, which is too definitive for the context of suggesting new laws.

Correct answer: are likely to

Explanation: The phrase 'are likely to' indicates a probability regarding the future consequences of drug use. It fits grammatically with the subject 'drugs' and maintains the future tense context of the sentence.

Meaning: 'Are likely to' means that something is expected or probable to happen.

Wrong options:

• are likely to: This option is repeated and is the correct answer, so it does not apply as a wrong option.
• definitely: 'Definitely' does not fit grammatically as it is an adverb and does not indicate a future possibility.
• claimed: 'Claimed' is in the past tense and does not fit the future context of the sentence.

Correct answer: suggests

Explanation: The verb 'suggests' is in the present tense, which is appropriate as it indicates the ongoing implications of the previous statements about social inequality. It fits grammatically as it serves as the main verb of the sentence, indicating what the overall findings imply.

Meaning: To 'suggest' means to propose or indicate something as a possibility or recommendation.

Wrong options:

• declared: 'Declared' implies a strong statement or announcement, which does not fit the context of suggesting implications about social inequality.
• definitely: 'Definitely' is an adverb that expresses certainty, but it does not serve as a verb in this context.
• asserted: 'Asserted' suggests a strong claim or declaration, which is too definitive for the context of suggesting implications.