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2. When Carol got to the bus stop, the last bus had left.
3. I went to see the dentist after I had made an appointment.
4. The workmen had finished when the new owners moved in.
5. They haven't been to Nha Trang since their last holiday.
6. When the police arrived, the burglar had escaped.
7. It was raining heavily as Laura walked to the office.
8. I last went to my home town two years ago.
9. At once I knew him.
10. She had never gone to the capital city before.

11. By the time the police arrived too late, the robbers had got away.
12. When did you have your motorbike?
13. I was having my breakfast when the phone rang.
14. I though I had seen the house before.
15. I took a taxi because I had missed the bus.