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.