6. His father　　　　 　(come) back from Beijing this evening.

5. Look! The girls　　　 　(sing) happily together.

4. - 　　　　　you 　　　　(learn) a lot about computers?　

-Yes, I have.

3. Last week, I　　　　 (buy) a new bike for my son.

2. Can you finish　　　　 (write) the letter in ten minutes?

1. We each 　　　　　(have) a dictionary in our class.　　

20. I have two brothers. One is a doctor, 　　　　one is a teacher.

　　　 A. other　　 　　 B. others　 　 C. the other　 　　　 D. some other.