He fell asleep immediately last night; he must ________ (be) very tired.
have been
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Heaskedmewhethermybrother________(fly)toBeijing.
Tosucceedinascientificresearchproject________.
Night________(fall),wehurriedhome.
Hotmetal________asitgrowscooler.
Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.