学校正在对考试作弊事件展开调查。

The school is conducting an ___investigation into the cheating incident during exams.

警方正在对这起交通事故进行详细调查。

The police are carrying out a thorough ___investigation into the traffic accident.

警方对这个案件展开了全面调查。

The police conducted a thorough ___investigation into the case.