填空题。 1. We can use water to_______. 2. 和this相对的是______。 3. —_____ do we use water? —We use water to wash clothes. 4. Water comes from the_____. 5. I’m up ____ the sky. (填上合适的介词) 6. I can ______ with water. 7. We’re ______ .We need water. 8. He says _____.(happy)