| A. How do we use water? B. What should we do? C. Where does water come from? D. When do we need water? E. Does water come from the rain, too? |
John: Water is very important.
Mary: It comes from the sea.
John:
Mary: Yes, you are right.
John:
Mary: We use water to wash clothes.
John:
Mary: When we are thirsty.
John: Water is so useful.
Mary: We should keep the water clean.