EXERCISE 3I. CHỌN TỪ/ CỤM TỪ THÍCH HỢP (ỨNG VỚI A, B, C, D) ĐỂ HÒAN TH...

47. You needn

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t have waited for them A. You needn

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t wait for them. B. You didn

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t have to wait for them. C. They didn

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t expect you to wait for them. D. You didn

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t need to wait for them. 48 Every student is required to write an essay on the topic. A. Every student might write an essay on the topic. B. Every student must write an essay on the topic. C. They require every student write an essay on the topic. D. Every student should write an essay on the topic.