根据句意，用所给动词的适当形式填空。
1. Listen! They _________ (talk) about the new film.
2. Jim asked us what _________ (happen) in China in 1976.
3. My mobile phone _________ (steal) on a bus last week.
4. The host __________ (interview) the little boy just now.
5. The Greens _________ (watch) TV now.
6. He said that he _________ (ring) me up when he got there.
7. We _________ (learn) English for about three years.
8. My brother__________ (join) the League in 1997.
9. The farmers _________ (pick) apples when I saw them.
10. The red skirt _________ (cost) the girl forty yuan.