1) You........smoke. a) must b) mustn't 2) You ..... use your smartphone in class. a) must b) mustn't 3) You...............play with fire. a) must b) mustn't 4) You..... wash your feet. a) must b) mustn't 5) You.....tidy up your room. a) must b) mustn't 6) You ...... help in the house. a) must b) mustn't 7) You.....eat on the train. a) must b) mustn't 8) You.....wear a helmet. a) must b) mustn't

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