题目内容：

Natural resources are things 1. exist in nature and can be used by people. Some natural resources are renewable, like trees. When one tree is cut down, we can plant a new tree to replace it. Others, 2., are not renewable, like the coal dug out of the ground. Once it is used, it is 3.. (go)

Although we all know that our natural resources are limited, we often waste them in our daily life. Paper, bottles and cans 4. (throw) away carelessly; food is wasted just because of  its  poor  taste; clothes  are  rejected 5. (simple) due  to  their  old fashion. These valuable natural resources will run out before long 6. better use is made of them.

Actually, everyone can make contributions (贡献) to 7. (protect) our natural resources. For example, 8.riding a bicycle or walking instead of driving, we can save lots of petrol. Water is a very important natural resource because we all need 9. to stay alive. We can make wise10. (choose) to save water, like reusing the water that has been used to wash vegetables to water flowers.