20. The traffic _____ stop when the lights are red.

A. must　　　　　 B. mustn’t　　　 C. may　　　　　　 D. can’t

19. ___ I use your dictionary? I want to look up this word.–Sure. Here you are.

A. Must　　　 B. Should　　 C. Shall　　 　D. Can

17. The ice is thin. You ____ skate on it. 　　 A. may　　 B. must　　C. can't　　D. needn't 18.-Must I stay at home and take care of her ?　 -No, you ________．

A．mustn't 　　B． won't　　 C can't　 D． needn't

16.---We need to come up with a plan.　 ---Oh, let’s have lunch first.

　 ---No, we ___ put off making a plan. Tomorrow is Clean-Up Day.

　 A. can 　　　　　　 B. will　　　　　 C. can’t　　　　　 D. must

15. -- What can you do for the sick kids in the hospital?

　 -- Well, I ______ tell funny stories and jokes.

　 A. can 　　　　　　 B. must C. need　　　　　 D. should　

14. Having a blog(博客)__________help me make more friends.

　 A. can　　　　　 B. must　　　　 C. need　　　 D. should

13. Miss Wang has been afraid of ______ alone since she was young.

　　　 A. being　　 B. be　　　 　　 　C. to be　　　 D. is

12. I met Judy just now and called her loudly. But she didn’t hear me and kept on ______.　　 A. walk　　　 　 B. walks　　 C. to walk　 D. walking

11. When the teacher came in, the students stopped ___and waited quietly .　 A. talk　 　　 B. to talk　 C. talking　　　　 D. talked　

10.--- Stop ____　 chocolates, my boy. They are bad for your teeth.

　　 A. eat　　　　　　 B. eating　　　　 C. eaten　 　　　　　 D. to eat