12. By Christmas, I _______ for Mr. Smith for six years.
A. will have been working
B. will work
C. have been working
D. will be working
13. I _______ in the room right now.
A. am being
B. was being
C. have been being
D. am
14. I ______ to New York three times this year.
A. have been
B. was
C. were
D. had been
15. I'll come and see you before I _______ for the States.
A. leave
B. will leave
C. have left
D. shall leave
16. The little girl asked what _______ to her friend.
A. has happened
B. happened
C. had happened
D. would have been happened
17. John ______ a book when I saw him.
A. is reading
B. read
C. was reading
D. reading
18. He said he _______ return later.
A. will
B. would
C. can
D. would be
19. Jack ________ the door.
A. has just opened
B. open
C. have opened
D. opening
20. I have been waiting for you ______.
A. since early morning
B. since 9 a. m
C. for two hours
D. All are correct