We will fly a kite as soon as your homework _______.

A. finishes        B. will be finished           C. has finished   D. is finished 

We will fly a kite if your homework _______ before 3 o’clock.

A. finishes     B. will be finished  C. has finished  D. is finished

 “ Can you fly a kite?” “ No, I ______.”

A. mustn’t B. needn’t C. can’t D. couldn’t