阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

The Longji Rice Terraces (龙脊梯田) were built by the local Zhuang and Yao people, to whom Guangxi is home. Starting in the Yuan Dynasty, work on the terraces took hundreds of years. The terraces are  (clever) designed, with hundreds of waterways that connect with each other. During the rainy season, it is along these waterways that rainwater  (move) down the mountains and into the terraces. These terraces also provide a perfect environment for birds and fish, some of which feed on insects  can harm the rice crops. Today the Longji Rice Terraces attract thousands of visitors who come to admire this great wonder created by people and nature working together.