题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

High on the Qinghai-Tibet Plateau 1.(lie) China’s “water tower” Sanjiangyuan. It is home to the headwaters of China’s three rivers: the Yellow River, Yangtze River, and Lancang(Mekong) River. It is the three rivers 2. provide water for about half the population of China. However, human activities are putting this ecosystem 3. risk. Hopefully, though, we can repair this damage. In 2016, the Chinese government established Sanjiangyuan National Park in Qinghai province. The park, 4.(schedule) to open in 2020, has increased the area’s green coverage and attracted more wildlife. The local government has also made great effort to improve biological diversity. The success of Sanjiangyuan will mark the start of a 5.(green) future. With Sanjangyuan 6.(take) the lead, nine other regions in China 7.(choose) by a field conservation station to carry out projects over the past three years, 8. will form a national park system together. The idea of a national park system is still new in China, but9.(it) realization is urgent. After all, building an ecological civilization bears great  10.(important) in the development and progress of human civilization.