1) You __use your mobile phone at school. a) must b) mustn't 2) There isn't a lift so we _ use the stairs. a) must b) mustn't 3) You __ use listen to music when the teacher is talking. a) must b) mustn't 4) You__ buy a ticket if you want to take the train. a) must b) mustn't 5) You __ run, you are holding scissors! a) must b) mustn't 6) You __ do your homework! a) must b) mustn't

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