1) All the students ____________ obey the school rules.. a) have to b) has to c) must to d) must 2) We ___________work overtime to finish this project. a) have to b) has to c) must to d) must 3) I __________book a hotel for my trip next week. a) have to b) has to c) must to d) must 4) Students ________ listen to the teacher or they won’t understand. a) have to b) has to c) must to d) must 5) The exams are next week. I __________ work harder. a) have to b) has to c) must to d) must 6) If Kathy wants to stay healthy she_________ have a diet high in fiber and low in fat. a) have to b) has to c) must to d) must 7) You _____________ be eighteen to get a driver's license. a) have to b) has to c) must to d) must 8) You _________ return them. They are too small for you. a) have to b) has to c) must to d) must 9) You _________ read the instructions carefully before you turn on the machine otherwise it could be dangerous. a) have to b) has to c) must to d) must 10) You __________ a mobile phone in class a) mustn't  b) don't have to  c) does't have to 11) We ___________ feed the animals. It’s forbidden. a) mustn't b) don't have to c) does't have to 12) You _______ turn on the central heating. It’s automatic a) mustn't b) don't have to c) does't have to 13) My wife __________ go to work today. It’s a holiday. a) mustn't b) don't have to c) does't have to 14) You __________ come with us if you don’t want to. a) mustn't b) don't have to c) does't have to 15) She ___________ come to the dentist’s with me. a) mustn't b) don't have to c) does't have to 16) You _________ shout. I can hear you. a) mustn't b) don't have to c) does't have to 17) You ___________apologise; it isn't necessary. a) mustn't b) don't have to c) does't have to 18) She ________go now; you can stay a bit longer. a) mustn't b) don't have to c) does't have to 19) Visitors to the zoo __________feed the animals. a) mustn't b) don't have to c) does't have to 20) You _________drive so fast; we have a lot of time. a) mustn't b) don't have to c) does't have to

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