我不能告诉你是否应该去——那得由你决定。

I can't tell you whether you should go or not - that's ___for you to decide.

由你决定我的同事们是否应该参加这类课程，但总的来说我想推荐这个课程。

It is ___for you to decide whether my colleagues should take part in this kind of course or not, but all in all I would like to recommend this course.

最终批准由主管给出。

The final approval is ___for the director to give.