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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。
High on the Qinghai-Tibet Plateau (lie) China's "water tower" Sanjiangyuan. It is home to the headwaters of China's three rivers: the Yellow River, the Yangtze River, and the Lancang River. It is the three rivers provide water for about half the population of China. However, human activities are putting this ecosystem risk. Hopefully, though, we can repair this damage. In 2016, the Chinese government established Sanjiangyuan National Park in Qinghai Province. The park, (schedule) to open in 2020, has increased the area's green coverage and attracted more wildlife. The local government has also made great efforts to improve biological diversity. The success of Sanjiangyuan will mark the start of a (green) future. With Sanjiangyuan (take) the lead, nine other regions in China(choose) by a field conservation station to carry out projects over the past three years, will form a national park system together. The idea of a national park system is still new in China, but (it) realization is urgent. After all, building an ecological civilization bears great (important) in the development and progress of human civilization.