Meaning: 'Tackle' means to confront or take on a challenge, especially in a proactive manner, which is relevant to addressing the biodiversity crisis.

Wrong options:

• work: While 'work' can imply effort, it lacks the specific connotation of addressing a problem directly, making it less suitable in this context.
• figure: The verb 'figure' typically means to calculate or understand something, which does not fit the context of actively addressing a crisis.
• redress: Although 'redress' means to remedy or set right, it is less commonly used in this context and does not convey the proactive approach implied by 'tackle'.

Correct answer: tempered

Explanation: The word 'tempered' is fitting as it suggests that expectations have been moderated or softened due to delays, which aligns with the context of the sentence. It is used in the past participle form, correctly matching the tense of the sentence.

Meaning: 'Tempered' means to moderate or soften, indicating that the delays have led to a reduction in the initial high expectations for the summit's outcomes.

Wrong options:

• coppered: 'Coppered' is not a standard English term in this context and does not convey any relevant meaning related to expectations.
• whispered: While 'whispered' can imply a quiet expression, it does not fit the context of modifying expectations and is grammatically incorrect here.
• coated: 'Coated' implies covering something, which does not relate to the idea of moderating expectations.

Correct answer: drafted

Explanation: The term 'drafted' is appropriate as it indicates that the treaty was created or formulated, which is the intended meaning in this context. It fits grammatically as a past participle, aligning with the sentence structure.

Meaning: 'Drafted' means to prepare a preliminary version of a document, in this case, the treaty aimed at protecting biodiversity.

Wrong options:

• crafted: While 'crafted' implies careful creation, it is more artistic and less formal than 'drafted', which is more suitable for legal documents.
• drifted: 'Drifted' suggests a lack of direction or purpose, which does not fit the context of creating a treaty.
• rafted: 'Rafted' is not relevant in this context as it refers to the act of making a raft or could imply floating, which does not relate to treaty formulation.

Correct answer: negotiate

Explanation: The word 'negotiate' is suitable as it indicates the process of discussing terms to reach an agreement, which is the goal of the representatives at the summit. It fits grammatically as a verb in the infinitive form, consistent with the sentence structure.

Meaning: 'Negotiate' means to discuss something in order to reach an agreement, particularly in a formal context like international summits.

Wrong options:

• satiate: 'Satiate' means to satisfy fully, which does not apply to the context of reaching an agreement and is grammatically incorrect here.
• depreciate: 'Depreciate' means to reduce in value, which is irrelevant to the context of forming an agreement and does not fit grammatically.
• dispassionate: 'Dispassionate' describes a lack of emotion, which does not fit the action of negotiating, as negotiations typically involve emotional and strategic considerations.