He fell asleep immediately last night; he must ________ (be) very tired.
have been
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I prefer this diagram ________ that one.
Themorewelookedatthepicture,________.
“Have you moved into the new flat? ” “Not yet. The rooms ________ (paint). ”
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
