Natural resources are things that we use that come from Earth. Our 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(煤) 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 conserve(節(jié)約) those resources. _______ you try to conserve a natural resource, you try to use less of it, so it does not get used up so _______. One way that people conserve 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 conserve water _______ making sure that our pipes and taps do not leak(漏). We can also make ________ choices to conserve 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. news B. plan C. fact

5.A. When B. Although C. Whatever

6.A. slowly B. fast C. regularly

7.A. distance B. space C. place

8.A. alive B. alone C. asleep

9.A. about B. for C. by

10.A. generous B. funny C. wise

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