1. rang/was watching.
2.did you arrive/was happening.
3. were making/arrived.
4. went/were having/came.
5. began/was sitting.
6. were you doing/was working.
7. was/were leaving/fell.
8. saw/were trying.
9. was walking/felt/did not know.
10. were driving/appeared.
11. were you doing.
12.was reading.
13. saw/did not see/was looking.
14. met/went/went. Câu này hình như chưa hêts nek=))?