警方正在调查社区内发生的一系列盗窃案。

The police are ___investigating a series of thefts in the neighbourhood.

已成立一个委员会来调查此次安全漏洞的成因。

A committee has been set up to ___investigate the cause of the security breach.

这位侦探发誓要调查这起谋杀案，直到查明真相。

The detective vowed to ___investigate the murder until he found the truth.