1) line up a) must b) mustn't 2) push a) must b) mustn't 3) shout a) must b) mustn't 4) keep quiet a) must b) mustn't 5) sit nicely a) must b) mustn't 6) tidy up a) must b) mustn't 7) eat or drink in the classroom a) must b) mustn't 8) sit down a) must b) mustn't 9) be kind a) must b) mustn't 10) listen to the teacher a) must b) mustn't

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