All over the world ,people have cut down millions and millions of trees . Did you know many kinds of animals and plants are now disappearing ? In particular , trees are very important 1. Because they produce oxygen (氧气) and control（控制）the climate .
Now , many people are beginning to take these problems seriously . They are making wind generators (发动机) and planting new trees . There is a group in our class that picks up the garbage at school . Whether the weather is hot or cold we always do it . 2. I think we are setting a good example to everyone else.
I hope , in the future , the sky can be clearer , the water cleaner , and the land greener . Then both people and animals can have a greener Earth .
More and more people have realized the importance of spreading our （传统的）culture．
At the meeting the boss （赞扬） John for the progress he made．
I plan to go abroad to celebrate my twentieth birthday in （八月）．
This kind of silk feels much （柔软的） than that one．
The two little girls often stay together to （分享） their secrets．