He can't have been at home. He ________ been out., I shouldn't have refused the invitation. I _________ accepted the invitation., She may not have passed the exam. She ______ failed the exam., They must have arrived late. They _______ arrived early., You can't have switched the TV off. You _______ left the TV on., We should have paid by credit card. We _______ paid with cash., They couldn't have stolen the car at night. They ______ stolen the car at night., The pilot might not have died in the accident. The pilot ________ survived the accident.

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