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.

有色金属的焊接主要有铝与铝合金焊接、镁与镁合金焊接、铍焊接等。（）