1) We ... be quiet in the library. a) don't have to b) must c) have to 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) have to go 4) Children ... wear school uniform. a) don't have to b) have to c) must 5) Students ... listen to the teacher at the lesson. a) don't have to b) must c) have to 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) have to 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) have to 14) We ... tidy up our classroom after lessons. a) have to b) don't have to c) must 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) have to 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) mustn't 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

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