Saving the Earth 

     As time goes by, man is making the earth sick. People cut down too many trees and leave rubbish

everywhere. Factories let out their waste without doing anything to it. This has caused some serious

problems. For example, the land is sandy, the river is dirty, the air is less clean, even the temperature

of the earth is rising. What shall we do to save the earth? My suggestion is that we should plant more

trees, put the rubbish into dustbins and stop factories pouring waste directly into the air or rivers. In

all, we have only one earth, we should do everything to protect it, or we'll regret.

(答案不唯一)