1) You _____ use your mobile in class. a) must b) mustn't 2) You _____ return your library books on time. a) must b) mustn't 3) You _____ change your shoes for PE lessons. a) must b) mustn't 4) You _____ cheat in tests. a) must b) mustn't 5) You _____study for your exams. a) must b) mustn't 6) You _____ drop litter. a) must b) mustn't 7) You _____ listen to your teacher. a) must b) mustn't 8) You ______ do your homework. a) must b) mustn't

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