下列各句中划线的词语使用无误的一项是：（ ）

The essay you wrote is excellent, which a rapid improvement on your recent work.

Who will ______ your dog when you all go out for a holiday?

Ms. Steen is leaving soon to go back to America.Shall we have a party for her—-Sounds great! If we________,all our classmates will come.

The lion is considered the king of the forest as it is a(n) _______ of courage and power.