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.