26. You should take a__________ of the fine weather to paint the fence.

25. Can a__________ intelligence take place of human intelligence in the future?

23. The automobile caused a r__________ in our way of traveling. 24. The plan sounds s__________ enough but it will be difficult to put it into action.

22. The development of the steam engine was the greatest t__________ advance of the 19th

　century.

21. Let’s a__________ the problem and see what went wrong.

18. He r__________ his brother as captain because his brother was ill. 19. Can you r__________ what happened in your childhood to your present state of mind? 20. If you want to sell your product, you had better a__________ it. Unit 3

17. Even if Lincoln was not ready to admit it, blacks knew that this was a war against

　s__________.

11. We were impressed by the ruins of an a__________ building. 12. C__________ among youths to enter the best colleges is intense (激烈的). 13. The fairy's m__________ changed the two brothers into ducks. 14. Don't be late for your i__________, or you won't get the job. 15. The a__________ won two gold medals in the Olympics. 16. She a__________ that she had stolen the bicycle.

10. It is said that the pirates (海盗) buried their t__________ on this island. Unit 2

9. Her sudden disappearance was a complete m__________.