1) She can’t sleep. She __________ drink milk before sleeping. a) should b) shouldn't c) can d) must e) had better not 2) You _________ stay up late the night before exams. a) shouldn't b) should c) can't d) must e) had better 3) You ______________________always tell the truth. a) should b) shouldn't c) can d) mustn't e) can't 4) You ____________________be rude to old people. a) should b) shouldn't c) can d) must e) had better 5) Students _______________make noise in the class. a) shouldn't b) should c) must d) had better e) can 6) It is very hot here. You ___________open the window. a) should b) shouldn't c) can't d) must e) mustn't 7) She is tired. She ___________________ have a rest. a) should b) shouldn't c) must d) Had better not e) can't 8) We …………………….…. protect the environment. a) shouldn't b) should c) can d) must e) mustn't 9) We …………………….…. cut down the trees. a) shouldn't b) should c) must d) can't e) had better 10) He …………………….…. listen to the teacher carefully.  a) should b) shouldn't c) can d) mustn't e) can't 11) You ..................... turn off the lights. a) should b) shouldn't c) can d) had better not e) mustn't 12) We ......................... keep the sea clean.  a) should b) shouldn't c) can't d) mustn't e) had better not 13) He .................. play computer all the time. a) should b) shouldn't c) must d) can't e) had better 14) The road is icy. You ................... be careful.  a) should b) shouldn't c) must d) can't e) can 15) We ..................... eat fruit and vegetables. a) shouldn't b) should c) can d) mustn't e) can't

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