用动词的适当形式填空。

1. I'm frightened of _____ (travel) by plane.

2. What _____ (happen) to you just now?

3. Thank you for _____ (write) to me.

4. I found it easy _____ (learn) English well.

5. It _____ (take) us 3 hours _____ (finish) the work yesterday.

6. I will go to the library _____ (learn) some animals.

7. Andy is crazy about _____ (dance).

8. The following Saturday, we _____ (visit) the great museum.

9. Listen! Someone _____ (sing) Beijing Opera in the next room.

10. The baby _____ (weigh) 4 kilos when he was born.