1. As students, you show your respect to your teachers. A. must B. shouldn’t C. mustn't D. ought
2. I think you eat less chocolate if you want to lose weight.
A. should B. shouldn’t C. mustn’t D. can
3. The windows look clean. You wash them.
A. must B. mustn't C. don't have to D. ought to
4. You throw litter on the streets.
A. mustn't B. have to C. must D. don’t have to
5. We have plenty of time for doing the work. We be hurried.
A. don’t have to B. should C. mustn't D. ought to
6. Tell her that she be here by six. I insist on it.
A. shouldn’t B. must C. ought to D. don’t have to
7. It’s a school rule. All the students wear a uniform.
A. have to B. ought to C. don’t have to D. oughtn’t to
8. We put the fish in the fridge before it spoils.
A. mustn’t B. don’t have to C. oughtn’t to D. ought to
9. You do it now, and do not argue.
A. must B. ought C. mustn’t D. shouldn’t
10. You forget the keys or you can’t get in.
A. must B. mustn’t C. have to D. don’t have to

11. He has made so many mistakes in his essay that he do it all again.
A. can B. cannot C. doesn’t have to D. has to
12. It is a top secret. You tell anyone about it.
A. mustn't B. don’t have to C. mightn't D. mayn’t
13. You don't look well. You see a doctor.
A. shouldn’t B. should C. mustn’t D. can’t
14. You touch that switch, whatever you do.
A. must B. mustn't C. may D. have to
15. You type my essay again. It’s not necessary.
A. have to B. don’t have to C. must D. mustn’t