11. Have you finished _______ the book?
A. read
B. to read
C. reading
D. reads
12. The farmers taught us ______.
A. to how pick apples.
B. how pick apples.
C. how picking apples
D. how to pick apples
13. --______ I watch Pro. Brown from morning till night?
--No, you needn't.
A. Must
B. Can
C. May
D. Need.
14. Do you know ________?
A. how long has he lived here
B. how long he has lived here
C. he has lived here how long
D. he has lived how long here
15. We will go to the Great wall if it ______ tomorrow.
A. doesn't rain
B. won't rain
C. isn't raining
D. didn't rain