9.You mustn’t eat anything until you see the doctor.

　 You ____ eat something ____ you see the doctor.

8. He may know the answer to the question.

　　 ____ he _____ the answer to the question.

7.I like Chinese tea with nothing in it.

　 I like Chinese tea _____　 _____ in it.

5.Please remember to buy some DVDs for me.

　 ____　 ____ to buy ____ some DVDs.

　 you tell me how to get to the station ?

　 Can you tell me ____　 ____　 _____ the station ?

4.He didn’t leave until the teacher came back.

　　　 He _____ until the teacher ______.

3. They had a good time last night.

　　　 They ____　 ______ last night.

2.Please wait for your turn.

　　　 _____ _____ the queue.

　　　 Please wait _____　 _____.

1. How careful the boy is !

　　　 　What ___ ____ _____ he ____ !

24. “____ you ____(go) to the cinema this evening?” “No, I _____(see) the film two 　days ago.”

23. Look, Tom _____(swim) in the river. He often ____(swim) in summer.