is in charge of|was in charge of

戴维斯女士负责培训新员工。

Ms. Davies ___is ___in ___charge ___of training new staff.

谁负责这个项目？

Who ___is ___in ___charge ___of the project?

这位老师负责这次学校旅行。

The teacher ___was ___in ___charge ___of the school trip.