1. If it _____ (not rain), we will go for a picnic.
2. Look at the children! They _____ (play) happily.
3. Don't forget _____ (return) the book to Tom when you finish it.
4. Our geography teacher once told us that the earth _____ (go) around the sun.
5. He likes collecting all kinds of information. I often see him _____ (search) the Internet.
6. —Where is Mr. White? I haven't seen him for a few days.
    —He _____ (go) to Hong Kong.
7. —I'm too tired.
    —So am I. We'd better stop _____ (walk) and have a rest.
8. —Do you like listening to popular songs?
    —Sure. My family _____ (be) all music lovers (爱好者).
9. The summer holidays are coming. I _____ (fly) to the Hainan Island with my parents.
10. —Sally, your dress looks so nice! 
     —Thank you. It _____ (make) of silk.