1 . The ground is rather wet, so it ______(rain) last night. （所给词的适当形式填空）

2 . It ________ (rain) last night, for the ground is wet. (所给词的适当形式填空)

3 . Their answers are exactly the same－one of them must _______ (copy) from the other. (所给词的适当形式填空)

4 . My wallet is nowhere to be found. I must ___________ (drop) it when I was on the bus.

5 . I must ________ (sound) very proud of myself after the quiz, saying how easy it was and how I was sure to get a good grade.(所给词的适当形式填空)

6 . Rachel, you ________ (misunderstand) her! Mary would never say something like that. (所给词的适当形式填空）

7 . The hurricane must________(cause )a lot of damage yesterday. (所给词的适当形式填空)

8 . I must_____________（forget) to tell you that it got too crowded. so I moved the bench. (所给词的适当形式填空）

9 . Since nobody gave him any help, he ___________have done the research on his own.（根据句意填空）