1) Students ________ wear uniforms at school. a) must b) have to c) should 2) You ________ sweep the floor. I've already done it. a) don't have to b) mustn't c) should 3) You _______ drop litter here. It's against the rules! a) don't have to b) shouldn't c) mustn't 4) Sue missed her train yesterday and she __________ wait two hours for the next one. a) have to b) had to 5) I need your advice. ________ I tell them about the accident? a) Must b) Have to c) Should 6) It's a great book! You ________ read it! a) have to b) must c) shouldn't 7) Tom is lucky. He ________ get up early on Monday mornings because he starts school at 10 a.m a) doesn't have to b) mustn't c) shouldn't 8) When we were at school we ________ wear a uniform. a) must b) should c) have to d) had to 9) You __________ be an expert to use the basic functions of program. a) mustn't b) shouldn't c) don't have to 10) The museum is free. You _________ pay. a) don't have to b) mustn't c) shouldn't 11) You ________ park here. It's an emergency exit. a) don't have to b) shouldn't c) mustn't 12) If you can't sleep, you ________ drink coffee before you go to bed. a) shouldn't b) mustn't c) don't have to

should, have to, must, mustn't

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