cooperate

目击者被敦促配合调查。

Witnesses were urged to ___cooperate with the investigation.

为了让活动成功，所有部门必须通力合作。

For the event to succeed, all departments must ___cooperate.

如果我们都通力合作，这个项目会完成得快得多。

The project will be completed much faster if we all ___cooperate.