Meaning: 'Receive' means to be given something, especially in a formal context, such as an award or degree.

Wrong options:

• get: The verb 'get' is informal and does not convey the same level of formality required in this context, making it less suitable for an academic setting.
• awarded: 'Awarded' is a past participle that would require a different grammatical structure, such as 'will be awarded,' which does not fit the current sentence structure.
• bestow: 'Bestow' is a transitive verb that requires a subject performing the action, making it grammatically incorrect in this passive construction.

Correct answer: played

Explanation: The verb 'played' is the correct choice as it indicates an active role in the context of the sentence. It fits grammatically in the past tense, matching the narrative of Professor Couch's contributions to astrophysics.

Meaning: 'Played' means to have taken part in or contributed to something significant, in this case, the discovery of the universe's expansion.

Wrong options:

• wanted: 'Wanted' implies a desire rather than an action taken, which does not fit the context of making a significant contribution to a scientific discovery.
• performed: 'Performed' suggests an action but lacks the specific connotation of involvement in a role or contribution, making it less precise in this context.
• wished: 'Wished' indicates a desire or hope, which is not relevant to the context of actively contributing to a scientific discovery.

Correct answer: which

Explanation: The word 'which' is the appropriate relative pronoun to introduce the clause that provides additional information about galaxy clusters. It fits grammatically and contextually, linking the clause to the noun it describes.

Meaning: 'Which' is used to introduce a clause that gives more information about something mentioned previously, in this case, galaxy clusters.

Wrong options:

• that: 'That' could be used, but it is less formal and typically used for defining clauses, whereas 'which' is more appropriate for non-defining clauses like this one.
• some: 'Some' does not function as a relative pronoun and does not fit grammatically in this context.
• more: 'More' is an adjective that does not relate to the clause structure needed here, making it grammatically incorrect.

Correct answer: In addition to

Explanation: The phrase 'In addition to' is the correct choice as it indicates an extra element being added to the previous statement about Professor Couch's research activities. It fits both grammatically and contextually, linking the two ideas smoothly.

Meaning: 'In addition to' means alongside or as well as, indicating that there are additional activities beyond those already mentioned.

Wrong options:

• It seems that: This phrase introduces uncertainty and does not fit the context of stating facts about Professor Couch's activities.
• As a result of: This phrase implies causation, which does not align with the context of adding information about his activities.
• Instead of: This phrase suggests a replacement or alternative, which does not fit the context of adding to the existing information.