Meaning: 'Underestimated' means to have judged something to be less important or less capable than it actually is.

Wrong options:

• led: 'Led' is the past tense of 'lead,' which does not fit here as it implies guiding or directing, not misjudging someone's impact.
• learn: 'Learn' is a present tense verb that does not fit the past context of the sentence.
• revived: 'Revived' is the past tense of 'revive,' which does not relate to the action of misjudging someone's impact.
• putting: 'Putting' is a gerund form that does not fit grammatically in this context as it does not convey an action related to underestimating.
• those: 'Those' is a demonstrative pronoun that does not fit as it does not convey an action.
• against: 'Against' is a preposition that does not fit the grammatical structure required in this sentence.

Correct answer: those

Explanation: The word 'those' is a demonstrative pronoun that refers to specific years previously mentioned in the context. It fits grammatically as it indicates a plural noun, aligning with 'years.'

Meaning: 'Those' refers to specific items or people that are further away in time or space, in this case, the years being discussed.

Wrong options:

• led: 'Led' is a verb that does not fit as it does not refer to a time period.
• learn: 'Learn' is a verb that does not relate to the context of referring to years.
• revived: 'Revived' is a verb that does not fit as it does not refer to a time period.
• putting: 'Putting' is a gerund that does not fit grammatically as it does not refer to years.
• underestimated: 'Underestimated' is a verb that does not fit as it does not refer to a time period.
• against: 'Against' is a preposition that does not fit the grammatical structure required in this context.

Correct answer: revived

Explanation: The word 'revived' is the past tense of 'revive,' which fits grammatically as it describes the action of the tourist industry returning to life or becoming active again. This aligns with the context of the elephant population recovering.

Meaning: 'Revived' means to bring back to life or consciousness, in this case, referring to the tourist industry becoming active again.

Wrong options:

• led: 'Led' is a verb that implies guiding, which does not fit the context of the tourist industry becoming active.
• learn: 'Learn' is a verb that does not relate to the context of the tourist industry.
• underestimated: 'Underestimated' is a verb that does not fit as it does not describe the action of the tourist industry.
• putting: 'Putting' is a gerund that does not fit grammatically in this context.
• those: 'Those' is a demonstrative pronoun that does not fit as it does not describe an action.
• against: 'Against' is a preposition that does not fit the grammatical structure required in this context.

Correct answer: centred

Explanation: The word 'centred' is the past participle of 'centre,' which fits grammatically as it describes the focus of the awareness campaign. It aligns with the context of the campaign being organized around a specific event.

Meaning: 'Centred' means to be focused or concentrated on something, in this case, the ivory bonfire.

Wrong options:

• led: 'Led' is a verb that implies guiding, which does not fit the context of the campaign's focus.
• learn: 'Learn' is a verb that does not relate to the context of the campaign.
• underestimated: 'Underestimated' is a verb that does not fit as it does not describe the focus of the campaign.
• putting: 'Putting' is a gerund that does not fit grammatically in this context.
• those: 'Those' is a demonstrative pronoun that does not fit as it does not describe an action.
• against: 'Against' is a preposition that does not fit the grammatical structure required in this context.

Correct answer: led

Explanation: The word 'led' is the past tense of 'lead,' which fits grammatically as it describes the action of the campaign resulting in the ban on ivory trade. It aligns with the context of the campaign's outcome.

Meaning: 'Led' means to guide or direct, in this case, referring to the campaign guiding the decision to ban ivory trade.

Wrong options:

• underestimated: 'Underestimated' is a verb that does not fit as it does not describe the action of guiding or resulting in a decision.
• learn: 'Learn' is a verb that does not relate to the context of the campaign's outcome.
• revived: 'Revived' is a verb that does not fit as it does not describe the action of leading to a decision.
• putting: 'Putting' is a gerund that does not fit grammatically in this context.
• those: 'Those' is a demonstrative pronoun that does not fit as it does not describe an action.
• against: 'Against' is a preposition that does not fit the grammatical structure required in this context.