用所给动词的适当形式填空。

1. Mr Brown will go fishing if it____(not rain) tomorrow.

2. I think he        (be) back in a week.

3.  －Who           (knock) at the door?

     －I don't know. Let me go and see.

4. Bill is strict with himself.  He never        (leave) today's work for tomorrow.

5.  －       your uncle____    (return）the video tapes to Mr Fox?

     －No. They're still in his bedroorn.

6.I             (not allow)lo stay up late on weekends.

7. Mr Wang        (read) a newspaper in the office at this time yesterday.

8. Mr Green and his wife         (live)in London for a few years.

9. They never knew what           (happen) to the world in a hundred years.

10. About 400 years ago, Calileo(伽利略)proved that the earth___(go) around the sun.