Ⅰ. 用所给词的适当形式填空
1. It was ________ (difficulty)for human beings to predict weather in the past.
2. Let’s hope that all our troubles will________ (appear)soon.
3. There is a beautiful ________ (paint)on the wall in each room of my house.
4. It is well ________ (know) that the 2010 EXPO in Shanghai was a great success.
5. It takes ________ (little)time to go there by underground than by bus.
6. You must try your best to stop him ________ (make)the same mistake again.
7. What a ________ (sun) day it is today! Let’s go to the park.
8. We should do everything we can ________ (protect)the environment.
9. Playing too many computer games is ________ (harm) to you.
10. We should speak to the old man ________ (polite).
11. A computer is ________ (expensive) than a TV set.
