1) You __________________ drop litter. a) can't b) must c) can d) mustn't e) have to f) don't have to 2) _________________ you open the window, please? a) can't b) must c) has to d) mustn't e) don't have to f) can 3) It's raining outside. We _______________________ take an umbrella. a) must b) mustn't c) can d) have to e) don't have to f) can't  4) You ___________________ pick flowers. a) can't b) don't have to c) have to d) must e) can f) mustn't 5) Pupils ______________ do the homework. a) can't b) can c) have to d) mustn't e) don't have to f) must 6) Children _______________ study at school on holidays. a) don't have to b) have to c) must d) can e) can't f) doesn't have to 7) She is ill. She _______________ go to the doctor. a) don't have to b) mustn't c) can d) can't e) have to f) has to 8) She ____________ speak English very well. a) must b) have to c) mustn't d) don't have to e) can f) can't 9) He _____________ play football at all! a) mustn't  b) can't c) must d) has to e) don't have to f) can 10) Pupils _________________ wear a uniform. a) doesn't have to  b) can c) can't d) must e) mustn't f) has to

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