Cambridge C1 Advanced (CAE) — All Questions

Which sentence is correct?

• a.The scientists made a research into the virus.
• b.The scientists maked research into the virus.
• c.The scientists did research into the virus.✓
• d.The scientists made researches into the virus.

The correct collocation is 'do research', and 'research' is uncountable (no 'a', no plural). 'Make research' and 'researches' are both errors.

Which sentence is correct?

• a.Let's revert to the original plan.✓
• b.Let's revert back to the original plan.
• c.Let's revert back again to the original plan.
• d.Let's return back to the original plan.

'Revert' already means 'go back', so 'revert back' is redundant. The concise, correct form is simply 'revert to'.

Which sentence is correct?

• a.Neither of the proposals were acceptable.
• b.Neither of the proposals are acceptable.
• c.Neither of the proposals have been acceptable.
• d.Neither of the proposals was acceptable.✓

'Neither' is grammatically singular, so it takes a singular verb: 'Neither of the proposals was acceptable.' The plural 'proposals' in the phrase does not change the concord in careful written English.

Which sentence is correct?

• a.The role involves to plan events and to manage staff.
• b.The role involves planning events and managing staff.✓
• c.The role involves planning events and to manage staff.
• d.The role involves to plan events and managing staff.

'Involve' takes the gerund, and parallel structure requires both items in the same form: 'planning... and managing...'. Mixing gerund and infinitive breaks parallelism.