1道英语完形填空 写出单词Forests are important as sources of wood,but al

1道英语完形填空 写出单词
Forests are important as sources of wood,but also as recreation places for tired c________ people.They will do good to soil,w________ and air because they can keep water from running off,make w________ weak and clean air.In short,they are very important to people's life.
But unlickily,people have cut down too many trees since the early 1980s and in the 1990s,because of the polluted air and people's carelessness,many trees lost their l_______,their growth becomes slow and they finally die.Forests are becoming less.T______ like this can't go on and it is t________ to do something to protect forests.