21. When I looked out of the door, I found that my motorcycle ...........

A. was stolen

B. had been stolen

C. has been stolen

D. had stolen

22. When ........ you first ......... Ha Noi?

A. have/ visited

B. will/ visit

C. do/ visit

D. did/ visit

23. This is the first time I ........ Hanoi.

A. visited

B. am visiting

C. have visited

D. will visit

24. Right now, I ......... some help. What are you doing? Can you give me a hand?

A. am needing

B. need

C. will need

D. have needed

25. Last night, while I ......... a letter, the phone ...........

A. was writing/ was ringing

B. wrote/ was writing

C. wrote/ rang

D. was writing/ rang