1) You..........................turn the music too loud. a) must b) mustn't 2) You..........................smoke. a) must b) mustn't 3) You..........................bring your books to class. a) must b) mustn't 4) You..........................do your homework. a) must b) mustn't 5) You..........................listen to the teacher. a) must b) mustn't 6) You..........................cheat in a test. a) must b) mustn't 7) You..........................tidy up your room. a) must b) mustn't 8) You..........................be home on time. a) must b) mustn't 9) You..........................help in the house. a) must b) mustn't 10) You..........................play with fire. a) must b) mustn't 11) You..........................answer the teacher's question. a) must b) mustn't 12) You..........................use a telephone in class. a) must b) mustn't 13) You..........................annoy your little sister. a) must b) mustn't 14) You..........................eat in class. a) must b) mustn't 15) You ...........................chew bubble gum in school. a) must b) mustn't 16) You ........................bring pets to school. a) mustn't b) must 17) You ........................go to bed late. a) mustn't b) must 18) You ..........................listen to the guide at the museum. a) must b) mustn't

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