---It’s very important us to make plans before a new term.-Yes. You must try to make i

问题补充：

---It’s very important us to make plans before a new term.

---Yes. You must try to make it carefully.

A. of

B. for

C. to

D. in

答案：

A. of

(答案→)B. for

C. to

D. in

解析：it‘s +adj +for sb to do sth ，表示做某件事，是怎样的，故选B