16. I ( ) to repair the car while you were watching TV.
A. am trying
B. try
C. tried
D. was trying
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17. They ( ) in the suburb when she was only a child.
A. lived
B. live
C. have lived
D. are living
18. I will be very glad to go to the picnic if the weather ( ) fine tomorrow.
A. is
B. will be
C. would be
D. have been
They went to have their dinner after they ( ) the assignment.
A. had finished
B. finished
C. have finished
D. would finish
20.This is the first time you ( ) to China.
A. have come
B. came
C. are coming
D. come