11. The young man is old enough ______ the army.
A. to join in B. joined  C. join  D. to join
12. Granny told her _______ the cat any more.
A. not play with  B. to not play with
C. not to play with  D. don’t play with
13. He really doesn’t know_______ .
A. to talk about   B. to talk about what
C. what to talk  D. what to talk about
14. Jack decided________in Beijing before May Day.
A. to reach B. to get C. to arrive D. go
15. It took me an hour _______the homework yesterday evening.
A. to do  B. did C. doing D. do
16. I’m glad ________ you again.
A. to look at B. to see  C. looking  D. seeing
17. Mary asked me _______for her.
A. wait  B. waiting C. to wait D. waited
18. “_______,”said the great musician.
A. Let me to hear you to play  B. Let me hear you to play
C. Let me hear you play D. Let me to hear you play
19. Mother is sure _______.
A. win  B. to win  C. to be winning  D. won
20. Mike is waiting _______the doctor.
A. to see  B. for to see  C. see  D. for see