Ⅰ. 用所给词的适当形式填空(10分)
1. How long did it take _____ (clean) the classroom?
2. We are going to do some _____ (wash).
3. They like _____ (swim) in summer.
4. They saw many _____ (interest) things in the street.
5. Be quiet. They _____ (sleep) right now.
