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3. Circle the correct answers. 1. You must / mustn't be on time at school. 2. You must/mustn't listen to the teacher. 3. You must / mustn't use your phone in class. 4. You must/mustn't run in the corridors. 5. You must / mustn't do your homework. 6. You must / mustn't pay attention during the lessons. 7. You must/mustn't wear trainers when you do sport. 8. You must/mustn't run across the road. 9. You must/mustn't look after your pets. 10. You must/mustn't keep your bedroom tidy.​