4.   为了锻炼身体，他每天早上都练太极拳。

He practices  tai  chi  every morning ________  ______

3.   看！那些警察一定是在追小偷。

Look! The policemen must be___________  _________ the thief.

2.   托比起床晚了 ，上学可能会迟到。

Toby got up late. He might ______________  ________ _______ school.

1.   他们可能在拍电影。

They________ ___________  _______ a movie.

5.   ―What are the children doing there?
―-They_________ games, I guess.

A. must playing     B. must be play

C. could be playing   D. might playing

4.   She looked up and saw a bird____________ in the sky.

A. flies     B. flying       C. flew       D. to fly

3.   Why do you think___________ ？

A. is he running     B. he is running

C. he runs        D. he running

2.   Have you ever seen____________ alien?

A. a      B. an    C. the     D. /

1.   Mother is in the kitchen. She must ______________  for us now.

A. cook         B. be cooking

C. cooks        D. to cook

5. I saw a boy__________ (run) away from the school while I was waiting for a bus.