Ответ:

20.

3. He has already gone.

4. She went home at 4 o'clock.

5. How many times have you been there?

6. I haven't decided yet.

7. It was on the table last night.

8. I have just eaten.

9. What time did they arrive?

21

1.When were you there last time?

2. A.How long have you had it?

B. It's new. I bought it yesterday.

3. A. How long have you lived there?

B. Five years. Before that I lived in Mill Road.

A. How long did you live in Mill Road?

B. About three years.

4. A. How long have you worked there?

B. Nearly two years.

A. What did you do before that?

B. I worked as a taxi driver.