20. You should have told us your e-mail address ______ we could keep you well informed of our activities.

A. although　 B. as　　 C. so that　　 D. even if

19. The trees ______ in the storm have been moved off the road.

A. being blown down　 B. blowing down　　 C. to blow down　 D. blown down

18. He was sitting on the floor ______ by books.

A. surrounding　 B. surrounded　　 C. surroundings　　 D. surround

17. Please ______ me to take my raincoat, in case it rains.

A. remember　　 B. remind　　 C. recall　　 D. warn

16. Don’t leave her ______ outside in the rain; she will catch a cold.

A. waited　 B. wait　　 C. waiting　　 D. to wait.

15. --- Why did you ______ the fourth paragraph of your rewritten composition?

　 --- Because I thought it was off the point.

A. put out　 B. leave out　 C. make out　 D. figure out

14. I remember you mentioned the same thing on a ______ occasion.

A. late　 B. future　 C. precious　　 D. previous

13. If it is quite ______ to you, I will visit you this Sunday.

A. comfortable　 B. fair　 C. easy　 D. convenient

12. _______ is ______ mother of ______ success.

A. Failure, the, /　 B. Failure, the, the　　 C. The failure, /, /　　 D. A failure, the, /