题目内容：

It’s very important that we all recycle (再利用). In nature, everything____again. For example, when an animal dies, it becomes____animal’s food. Nothing is wasted. But humans have created things like plastic bags____can’t be broken down by nature. Our rubbish kills animals and____water and soil.____we continue making too much rubbish, the problem will only get worse. If nature can’t reuse the rubbish, we must recycle____

We should clean up the rubbish we’ve made because nature can’t.

Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees,____these materials are not endless. We use up our natural materials much____than the earth is able to reproduce them. For example, each year we cut____more that 6,000 square miles of forest. But it takes an average of 25 years for a new tree____

Recycling can help us save the earth, so let’s take action right now.

1.A. use    B. using    C. is used    D. used

2.A. another    B. other    C. others    D. the other

3.A. who    B. which    C. how    D. where

4.A. pollutes    B. polluted    C. polluting    D. is polluted

5.A. When    B. Whether    C. Why    D. If

6.A. them    B. their    C. it    D. itself

7.A. but    B. so    C. and    D. or

8.A. fastly    B. fast    C. taster    D. fastest

9.A. out    B. down    C. in    D. up

10.A. grows    B. for growing    C. growing    D. to grow