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He fell asleep immediately last night; he must ________ (be) very tired.
have been
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“Haveyoumovedintothenewflat?”“Notyet.Therooms________(paint).”
Night________(fall),wehurriedhome.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Heaskedmewhethermybrother________(fly)toBeijing.
Tosucceedinascientificresearchproject________.
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