1. 从所给的单词中选出合适的完成对话。

farmers,    clothes,    tap,    use,    useful

Ann: Where does water come from, Mum?
Mum: It comes from the sea, the rain and the
Ann: Is water very ?
Mum: Yes, it is. We use water to wash ，cook food, make drinks, clean the floor and so on.
Ann: How do use water?
Mum: They water to grow crops.