1) You ______ listen to the teacher. a) must b) mustn't 2) You _______use your phone in class. a) must b) mustn't 3) You _____ do your homework. a) mustn't b) must 4) You _____ be quiet in the library. a) must b) mustn't 5) You _____ take photos here. a) mustn't b) must 6) You _____ swim here. a) must b) mustn't 7) You _____ look after your pets. a) must b) mustn't 8) You ______ eat here. a) must b) mustn't 9) You _____ put the litter in the bin. a) mustn't b) must 10) You _____ walk on the grass. a) must b) mustn't

Unit 10 Grammar (must/ mustn't)

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