四、从方框中选择适当的单词填空。
useful, reuse, use, save, waste
1. We should energy.
2. We should not drive so much because cars a lot of energy.
3. Energy is for us.
4. We should not water. We should and save it.

五、连词成句。
1. clean, things, every, day, use, to, we, water (.)
2. coal, oil, comes, and, energy, our, most, of, from (.)
3. we, not, should, down, cut, many, too, trees (.)
4. much, too, plastic, bad, is, for, Earth, the (?)

() () ()
() () ()

二、选择与下列句子匹配的表达。
() 1. We should not waste water.
() 2. We should not drive so much.
() 3. We should not cut down too many trees.
() 4. We should not use too many plastic bags or bottles.
A. Because too much plastic is bad for the Earth.
B. Because trees help keep the air clean.
C. Because cars use a lot of energy which is limited(有限的).
D. Because there is not too much water.