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——Have you _____ the invitation to the party？ ——Yes， I have. And I've ______ it.
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——Could I speak to Mr Brown？ —— ______ ， I'1l go and see if he is in.
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Your English teacher looks very young； He _____ be over 30.
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——Need I clean the room now？ ——Yes， you _____ ， but you ______ ask someone to help you.
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——Don't forget to come to my birthday party tomorrow.——______.
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What do you think ______ an apple ______ to the ground？
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Why do you think ______ cut down the big tree？
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—— ______ if I smoked？ ——I'm sorry， but it's not allowed.
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Do you think his tie is _________？
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Mary said that she ___________ London.
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