1) You ... eat in class. a) must b) mustn't 2) You ... put out the fires. a) must b) mustn't 3) You ... walk on grass. a) must b) mustn't 4) You ... clean your bedroom. a) must b) mustn't 5) You ... clean your helmet when you ride a bike. a) must b) mustn't 6) You ... feed the animals. a) must b) mustn't

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