Ⅰ.用适当的词填空
1．________ scientists have learned a lot about the universe, there is much we still don't know.
2．He is a shy man, ________ he is not afraid of anything or anyone.
3．You like playing tennis, ________ I like reading.
4．________ it is snowing, it is not very cold.
5．She is American ________ she speaks Chinese very fluently.
6．I'd like to go with you, ________， my hands are full.
7．Shanghai is one of ________ (big) cities in the world.
8．The Yellow River isn't so ________ (long) as the Yangtze River.
9．The more, the ________ (good)．
10．People's life in that area is getting ________ and ________ (bad)．
