1.  When we reached Xie Chao Hill, we couldn't held crying.

2.  Although , in the society, we can learn much what we can't in the campus.

3.  When you read the words, if you only read and read and not to use you brain, you can't meory it well.

4.  After all, the campus can't instead of the outside world.

5.  We can not imange the world would be without water.

6.  The fresh water which we had today can't satisfied all the demand of our society, and at the same time, the problem of water polution is very seciously , and this destroyed the quality of the fresh water.

7.  I can't concetrate on my studying.

8.  Thus we can't abtain the wealth.

9.  If cheating can't be prohabited , students can't competitive with each other justly.

10.  I couldn't using my time freely.