Now in some places of our country, many people are cutting down the trees in the forests. They need more1to build houses and more farmland to grow crops and so on. The areas（面积）of forests are getting2. Some scientists say that there3no big forests in 20 or 30 years. It is really a(n)4thing.5the forests, we will have sandstorms（沙尘暴) often. The weather will get6.The earth will become a big desert（沙漠）. A lot of plants and animals will7. Crops will not grow anywhere. Life will be8for everyone.
So we should do our best9our living environment and keep our mountains10, the water clean, and the sky blue.
