语法填空
The Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese agriculture. 【小题1】(build)over 2,200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering 【小题2】(achieve)is still used today.
In ancient times, the region where Dujiangyan now stands 【小题3】(suffer)from regular floods from the Minjiang River. 【小题4】(help)the victims of the flooding, Li Bing, 【小题5】 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 floodwaters while leaving the river flowing naturally. 【小题6】(good)still, the extra water could be directed to the dry Chengdu Plain, making 【小题7】 suitable for farming.
Once the system 【小题8】(finish), no more floods happened and the people were able to live 【小题9】(peaceful). Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams, 【小题10】 the water is blocked with a huge wall, Dujiangyan still lets waterflow through the Minjiang River naturally, making the ecosystem(生态系统)and fish populations exist in peace.