1) You ....... play with matches, because you can burn yourself. a) must b) should c) mustn't 2) At the zoo you ....... feed the animals. a) mustn't b) shouldn't c) must 3) At school we ....... run in the corridor. a) must b) mustn't c) should 4) A: " I feel tired. B:' Well, you.....work a lot." a) shouldn't b) mustn't c) should 5) "Are you cold? You ....... put on warm clothes." a) shouldn't b) mustn't c) should 6) You ......... go to sleep. You look sleepy. a) mustn't b) must c) should 7) You ........ be quiet in the library. a) must b) mustn't c) shouldn't 8) You .......... pick the flowers in the park. a) must b) mustn't c) should 9) Children ........... take medicine alone. a) shouldn't b) should c) mustn't 10) You ........ read books in your free time. a) must b) should c) mustn't 11) You ........ go to school on weekdays. a) must b) should c) mustn't 12) You ........ forget to do your homework! a) should b) must c) mustn't 13) You ........ eat your fruits to be healthy. a) must b) mustn't c) shouldn't 14) You ....... help your friend if they need help. a) should b) shouldn't c) musn't 15) You ....... forget your homework at home. a) mustn't b) must c) should 16) You ....... stay up late on a school night. a) mustn't b) must c) should

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