1) They ________ talk to each other during the exam. a) don't have to b) mustn't 2) Passengers ________ speak to the driver. a) don't have to b) mustn't 3) I ________ be at the meeting but I think I’ll go anyway. a) don't have to b) mustn't 4) You ____ go to school tomorrow. It's holiday. a) don't have to b) mustn't 5) You ________ come if you don’t want to. a) don't have to b) mustn't 6) You ____ park in this area. a) don't have to b) mustn't 7) We ____ go to the party if we don't want to. a) don't have to b) mustn't 8) You ________ pay for your tickets now but you can if you want. a) don't have to b) mustn't 9) You ________ play with those wires. They’re dangerous. a) don't have to b) mustn't 10) I can stay in bed tomorrow morning because I ____ go to work.  a) don't have to b) mustn't 11) There's a lift in the building, so you ____ climb the stairs a) don't have to b) mustn't 12) You ____ forget what I told you. It's very important. a) don't have to b) mustn't 13) Don't make so much noise. We ____ wake the baby. a) don't have to b) mustn't 14) I ____ eat too much. I'm supposed to be on a diet. a) don't have to b) mustn't 15) You ____ arrive late. a) don't have to b) mustn't 16) There is another bus later, so we ____ get on this one. a) don't have to b) mustn't 17) The entrance is free of charge, so you ____ buy a ticket. a) don't have to b) mustn't 18) This is a non-smoking area, so you ____ smoke here. a) don't have to b) mustn't 19) It's Friday today. I ____ do any homework for tomorrow. a) don't have to b) mustn't 20) You ____ eat in the library. a) don't have to b) mustn't

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