题目内容：

Natural resources are things that we use that come from Earth.  Out natural resources are limited(有限的). This means that they will not________ forever.

Some are renewable, like when you plant a new tree when you_________ one down. Others are not renewable, like when you dig coal out of the _________. Once it is used, it is gone. People realize the_________ that Earth’s natural resources are limited, and can do things to help save those resources.__________you try to save a natural resource, you try to use less of it, so it does not run out so _________. One way that people save fuel, like gasoline, is by riding a bicycle or walking when the _________is short instead of driving everywhere. Water is a very important natural resource because we all need it to stay _______. We can keep water _________making sure that our pipes and taps do not leak(漏). We can also make __________ choices to save water, like only using the dishwasher or washing machine when they are full.

Everyone can make contributions to protecting natural resources.

1.A. last    B. spread    C. burn

2.A. turn    B. cut    C. put

3.A. station    B. building    C. ground

4.A. fact    B. plan    C. decision

5.A. When    B. Although    C. Whatever

6.A. slowly    B. hard    C. fast

7.A. distance    B. space    C. place

8.A. alive    B. alone    C. awake

9.A. with    B. for    C. by

10.A. surprising    B. funny    C. wise