1) You........ brush your teeth three times a day.  a) Must b) Mustn't 2) You........ forget to do your homework.  a) Must b) Mustn't 3) You ....... be nice to your classmates a) Must b) Mustn't 4) You........ wear warm clothes when it is cold outside. a) Must b) Mustn't  5) You ........chew gum in class. a) Must b) Mustn't 6) You .......... study hard if you want to pass your exams. a) Must b) Mustn't 7) You ........fight with your classmates. a) Must b) Mustn't 8) You ........play football in the classroom. a) Must b) Mustn't 9) You .......listen to your teacher very carefully. a) Must b) Mustn't 10) You........ be rude to your grandparents. a) Must b) Mustn't  11) You........feed zoo animals. a) Must b) Mustn't 12) You..... take photo in museums. a) Must b) Mustn't

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