The room is in a terrible mess; it ________have been cleaned.
.. All books ___________ to the library more than three days late will be subject to a fine.
.When he was only thirty years old, he had already experienced ___________ most people only experience when they are much older.
.___________ in the sports world, a sportsman needs to train constantly to keep himself in best condition.
.Listen, Mike. She ________________ have done it. She's been with me at the shop all day.
.—Do you want to go to the cinema tonight? —Sorry, I’m so tired. I ___________ an early night.
ess; it ________have been cleaned.ess; it ________have been cleaned.
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