选择方框里词的适当形式填空。

over ,   earth  ,  thousand , to  , wet

Rainforests cover 6 % of the  小题1: surface. Many animals live in rainforests. Quite a lot of them live in the trees 　小题2:　　30 meters from the ground. There are lots of tall trees and   小题3:　of other different plants. It’s always dark and hot in rainforests and the ground is always  小题4: .
Rainforests are very important  小题5:  us. They are the lungs of the earth. The plants in the forests help to make the air fresher.