1. When we see dark _______ in the sky, we know that rain may come soon.

　A. stars

　B. planes

　C. clouds

　D. things

　[解析]此题容易误选A、B。如果不清楚这是一道常识题的话，一看到in the sky就会想当然地错选为A或B这两项，因为这两样东西经常出现在天空中。由下文中的we know that rain may come soon可知“很快就要下雨了，那么一定是看天空中的’乌云’了”。因此正确答案为C。

4. Does the house belong to Mr. Brown 5. Make sure to turn off all the lights before you leave 6. Ten years later, his dream of studying in France came true 7. His uncle has already been to Australia twice 8. When will the plane take off 9. Do you have something interesting to tell me 10. Japan lies to the east of China 11. Listen! They are talking to each other in German 12. Give the workbooks out to the children 13. How far is it from Sydney to Beijing 14. What is the population of this town 15. When spring comes, it’s getting warmer and warmer 16. It’s impolite to laugh at those people in trouble 17. By the way, what are you going to do this afternoon 18. Mr. Wang has at least 500 books 19. It is said that the school sports meet will be put off 20. Thanks to Mr. White, the boy returned to his parents　

3. To our surprise, the boy can move that big box

2. Ten stories make up the book

1. How / What about going boating in the park tomorrow afternoon

19. make friends with　 20. put out the big fire

17. getting along with　 18. provided the children with

15. concentrate ourselves on　 16. come out

13. turn the radio down　 14. pay attention to

11. in the future　 12. saying “good-bye” to his friends