奈杰尔正在进行一项关于早期基督教艺术的研究。

Nigel is ___carrying ___out research on early Christian art.

医院正在进行检查以找出她的问题所在。

The hospital is ___carrying ___out tests to find out what's wrong with her.

别怪我，我只是在执行命令。

Don't blame me, I'm only ___carrying ___out my orders.