investigate|investigates|investigated|investigating

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.

科学家调查病毒如何在不同物种间传播。

The scientist ___investigates how the virus spreads among different species.

科学家调查了这种新药对患者的影响。

The scientist ___investigated the effects of the new drug on patients.