1) We ... be quiet in the library. a) don't have to b) must c) mustn't 2) We ... write in books in the library. a) have to b) must c) mustn't 3) Children ... go to school at weekends. a) don't have to b) must c) mustn't 4) Children ... wear school uniform. a) don't have to b) have to c) mustn't 5) Students ... listen to the teacher at the lesson. a) don't have to b) must c) mustn't 6) Students ... cheat at exams. a) have to b) must c) mustn't 7) You ... feed wild animals in the zoo. a) don't have to b) must c) mustn't 8) We ... brush our teeth every day. a) don't have to b) must c) mustn't 9) We ... wash our hands before lunch. a) don't have to b) must c) mustn't 10) You ... ride a bike without a helmet. a) have to b) must c) mustn't 11) You ... play computer games all day. a) have to b) must c) mustn't 12) We ... save water. a) don't have to b) must c) mustn't 13) We ... do the dishes. a) don't have to b) must c) mustn't 14) We ... tidy up our classroom after lessons. a) have to b) don't have to c) mustn't 15) We ... take care of our pets. a) don't have to b) must c) mustn't 16) We ... eat enough fruit and vegetables. They are good for our health. a) don't have to b) must c) mustn't 17) We ... eat much fast food. It is bad for our health. a) have to b) must c) mustn't 18) Mum ... cook tonight. We're eating at a restaurant. a) don't have to b) must c) doesn't have to 19) You ... water the plant. a) must b) mustn't c) don't have to 20) I ... get up early to catch the school bus. a) mustn't b) have to c) has to

Must / Mustn't / Have to / Don't have to

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