1.  They cut down the trees and built some tall building to sell at a high price.

2.  they cut down trees, so that the soil often was washed into river by raining.

3.  Because he had nothing on really, so the stone cut his skin.

4.  So I like the night of power cut .

5.  I doesn't like the night of power cut , because I must go over the homework.My little friends are the same as me, they must study .

6.  We can find some methods to cut down the industrial use of water.

7.  Firstly we must cut down the high birth rate.

8.  So fresh water is cutting down.

9.  On the one hand, we must take actions to cut down the excessive demands for water by controlling the overpopulation.

10.  people had do something in keep envoriment clean, so it cut off the illness's source.