1) You ______ be on time. a) must b) mustn't 2) You ______ smoke. a) mustn't b) must 3) You _______ listen to the teacher. a) mustn't b) must 4) You ________ use your phone in class. a) mustn't b) must 5) You ________ run in the corridors. a) must b) mustn't 6) You _______ do your homework. a) mustn't b) must 7) You ______ fight with other children. a) mustn't b) must 8) You _____ put your rubbish in the bin. a) must b) mustn't 9) You ______ go fishing in the lake alone. a) must b) mustn't 10) You ______ keep dogs under control. a) mustn't b) must 11) You ________ leave rubbish in the street. Put it in the bin! a) mustn't b) must 12) It’s late. I ______ go home now. a) mustn't b) must 13) We ______ pollute rivers. It’s bad for the environment. a) mustn't b) must 14) When you are driving, you ______ stop at a red light. a) mustn't b) must 15) Shh! We _____ talk in the library. a) mustn't b) must

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