1) You ______ be quiet in a library. a) should b) must c) shouldn't d) mustn't 2) You look tired. I think you ______ get some sleep. a) should b) must c) shouldn't d) mustn't 3) You ______ be over 18 to get a drivers license. a) should b) must c) shouldn't d) mustn't 4) You _______ wait for the light to turn green before you cross the street. a) should b) must c) shouldn't d) mustn't 5) You __________ play too much video games. It's bad for your eyes. a) should b) shouldn't c) must d) mustn't 6) You _________ eat healthy and exercise regularly. a) should b) shouldn't c) must d) mustn't 7) -I have a stomachache. -You __________ see the doctor. a) should b) shouldn't c) must d) mustn't 8) You __________ cross the yellow line. It's dangerous! a) must b) mustn't c) should d) shouldn't 9) You _________ enter if you don't work here. a) must b) mustn't c) should d) shouldn't

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