2 . You __________ not have treated Tom in that way. It was unfair. (用适当的词填空)

3 . He had known the matter before you told him, so you __________ not have told it to him. (用适当的词填空)

4 . Since the ground is white. it __________ have snowed last night. (用适当的词填空)

5 . We ____________ have studied last night, but we went to the concert instead. (用适当的词填空)

6 . I didn’t hear the phone. I __________ have been asleep. (用适当的词填空)

7 . I can’t find Mr. Smith anywhere in the office building. Where __________ he have gone? (用适当的词填空)

9 . I didn’t see her in the meeting room this morning. She __________ not have spoken at the meeting. (用适当的词填空)

10 . They __________ have missed the plane, or perhaps they have been prevented from coming for some reason. (用适当的词填空)