为加强水体治理，珠江流域某城市构建了较大面积的人工湿地。

(1)当污染物随水流进入该湿地时，湿地水体中碳元素的迁移和转化途径如下图。请用箭头和文字补充虚线框中的碳转化途径。

(2)一段时间后，湿地中出现了轮虫等浮游动物，可控制绿藻等浮游植物的增殖；管理员还放养了一些鱼和鸭，为城市增添自然气息。请写出可能存在的食物链_______(两条)。

(3)如果含有重金属的工业废水进入该系统，请根据生态学基本原理，指出可能产生哪些负面影响。_____________。

句型转换。

1. What's wrong with your legs? (改为同义句)   

    What's ________ ________ with your legs?

2. You need to water these flowers. (改为同义句)   

    These flowers ________ ________.

3. We helped her back into water. (改为同义句)   

    We helped her ________ ________ into water.

4. They have lived here for eight years. (对画线部分提问)   

    ________ ________ have they lived here?

5. I said that we should protect the animals better. (对画线部分提问)

    ________ ________ you _________?