Meaning: 'Distinct' means clearly different or unique from something else.

Wrong options:

• cognitive: Cognitive is an adjective related to mental processes, which does not fit the context of describing nations.
• constitution: Constitution refers to a system of fundamental principles or established precedents, which does not describe the nature of the nations.
• robust: Robust means strong or healthy, but it does not appropriately describe the relationship between the nations in this context.
• consequences: Consequences refer to the results of actions, which does not fit as a descriptor for nations.
• domains: Domains refer to areas of knowledge or activity, which does not apply to the description of nations.

Correct answer: proximity

Explanation: The term 'proximity' refers to the state of being near or close to something, which is relevant in describing the geographical closeness of Australia and New Zealand. This fits both grammatically and contextually, as it highlights an important aspect of their relationship.

Meaning: 'Proximity' means nearness in space, time, or relationship.

Wrong options:

• domains: Domains refer to areas of knowledge or activity, which does not fit the context of geographical closeness.
• cognitive: Cognitive relates to mental processes and does not pertain to physical distance.
• distinct: Distinct describes differences between entities, which does not apply to the concept of closeness.
• constitution: Constitution refers to a system of laws or principles, which is unrelated to geographical terms.
• robust: Robust means strong or vigorous, which does not describe the concept of nearness.

Correct answer: domains

Explanation: The word 'domains' refers to specific areas of activity or knowledge, which fits well in the context of the various fields in which Australia and New Zealand cooperate. This maintains grammatical coherence and aligns with the overall theme of their relationship.

Meaning: 'Domains' means areas of expertise or fields of activity.

Wrong options:

• cognitive: Cognitive relates to mental processes and does not fit the context of areas of cooperation.
• distinct: Distinct describes differences and does not apply to the concept of fields of cooperation.
• constitution: Constitution refers to a system of laws, which is not relevant to the context of cooperation.
• robust: Robust means strong or healthy, which does not describe areas of cooperation.
• proximity: Proximity refers to nearness, which does not fit the context of specific fields.

Correct answer: robust

Explanation: The term 'robust' is an adjective that describes something as strong and healthy. In this context, it emphasizes the strength of the international relationships formed between Australia and New Zealand, fitting both grammatically and contextually.

Meaning: 'Robust' means strong and effective in terms of performance or structure.

Wrong options:

• domains: Domains refer to areas of knowledge or activity, which does not describe the quality of relationships.
• cognitive: Cognitive relates to mental processes and does not fit the context of describing relationships.
• distinct: Distinct describes differences and does not apply to the strength of relationships.
• constitution: Constitution refers to a system of laws, which is not relevant to the quality of relationships.
• proximity: Proximity refers to nearness, which does not describe the strength of relationships.