Viết lại câu dựa vào từ cho sẵn

1. Why did you go home early? (you needn't/go/go early)

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2. I wonder why Tom didn't phone me (he must/forget)

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3. You've sihned the contract. (it/can't/change/now)

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4. What's Linda doing? I'm not sure (she may/watch/television)

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5. Ann was standing outside the cinema. (she must/wait/for somebody)
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