1) He ________ study for the test. a) must b) mustn't 2) They ________ skateboard in the road. a) must b) mustn't 3) I ________ leave litter in the park. a) must b) mustn't 4) He ________ tidy his room.  a) must b) mustn't 5) They ________ eat too much chocolate. a) must b) mustn't 6) We ________ speak English in class. a) must b) mustn't

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