1 . 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 wise    10     (choose) to save water, like reusing the water that has been used to wash vegetables to water flowers.

In 1916 the United States started the world's first national park system. Since then, it     1    （serve）as a model for other countries that try to better protect the environment and let people enjoy nature.

A national park is a reserve of land    2    declare) and owned by the government, protected from human development and pollution. Now China is planning its own national parks system. On Dec 5, China passed two pilot plans for national parks    3    (protect) the giant panda, Siberian tiger and Amur leopard.

But national parks are not only for animals. In mid-2015, China started to build pilot national parks in nine provinces.     4    most famous one is the Sanjiangyuan national park on the Qinghai-Tibet Plateau. It aims to protect China’s water source. Sanjiangyuan, or “Source of Three Rivers”, is     5    the Yellow, Yangtze, and Lancang rivers start.

Before this national park project, China had set     6    thousands of nature parks, forests and scenic areas as protected areas. However, they haven’t been managed well     7    too many different organizations have been involved in the protection of the different areas, according to the China Daily.Under the new plan, national parks will cover big areas and include different protected areas.

For example, the habitats of wild pandas lie in different provinces and     8    (cut) into even smaller pieces by railways, roads and power lines. This makes isolated panda groups more open to     9    (dangerous). The panda national park will cover all the habitats and make the protection of animals as comprehensive as possible.

But this increased protection doesn’t mean national parks will shut their doors to humans. Instead, the new system will offer people a chance to     10    (deep) feel nature.