Bài 25 :
7. Complete the following sentences, using must/ mustn't, and the words given.
(Hoàn thành các câu sử dụng must/ mustn't, và các từ được cho.)
1. If you are sick, you/ go to see the doctor.
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2. When you are on the airplane, you/shout.
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3. Before you go to bed, you/brush your teeth.
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4. When you are in the library, you/ talk loudly.
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5. When you are doing an English test, you/ use a dictionary.
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6. When you are in a car, you/ fasten your seat belt.
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