1) You _____ wear warm clothes in winter. a) mustn't b) should c) don't have to 2) ____ I ask you a question, please? a) must b) shouldn't c) may 3) It is raining now, you _____ an umbrella. a) need b) must c) can 4) _____ I use you phone to call a taxi? a) must b) have c) may 5) We are in the library. We _____ be quiet. a) can't b) must c) can 6) You look sick, you _____ visit a doctor. a) should b) may c) can't 7) Drivers _____ stop, when the traffic lights are red. a) may not b) must c) don't have to 8) You _____ eat more fruits for your health. a) have b) needn't c) should 9) I _____ another pen, because my pen doesn't write. a) need b) can c) may 10) In my opinion, you visit your grandparents. a) mustn't b) don't have to c) should

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