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。
Dujiangyan is the oldest man-made water system in the world,
and a wonder in the development of Chinese science.{#blank#}1{#/blank#}(build) over 2, 200 years ago in what
is now Sichuan Province in Southwest China, this amazing engineering{#blank#}2{#/blank#}(achieve) is still used today.
In ancient times, the region in which Dujiangyan now stands{#blank#}3{#/blank#}(suffer) from regular floods caused by
overflow from the Minjiang River.{#blank#}4{#/blank#}(help) the victims of the flooding, Li
Bing, the region governor, together with his son, decided to find a solution.
Li designed a series of channels built at different levels along Mount Yulei
that would take away the floodwater while leaving the river flowing naturally. {#blank#}5{#/blank#}(good) still, the extra water could be
directed to the dry Chengdu Plain, making {#blank#}6{#/blank#}suitable for farming.
Once the system was finished, no more floods occurred and
the people were able to live {#blank#}7{#/blank#}
(peaceful). Today,
Dujiangyan is admired by scientists from around the world because of one
feature. Unlike modern dams{#blank#}8{#/blank#} the water is blocked with a huge wall,
Dujiangyan still lets water flow through the Minjiang River naturally,{#blank#}9{#/blank#} (enable) ecosystem(生态系统)
and fish populations to exist {#blank#}10{#/blank#}harmony.