21.　　 How about _______ (go) fishing?

20.　　 Thank you for _______(help) me.

19.　　 We are going __________ (study) in Japan.

18.　　 I spent twenty years in _______ (write) the novel.

17.　　 It took me more than a year ______ (learn) to draw a beautiful horse in five minutes.

16.　　 They are good at ______ (boat).

15.　　 You shouldn’t ______ (have) the students ______ (work) so hard.

14.　　 Let me _____ (sing) a song for you.

13.　　 His brother often makes him ______ (stay) in the sun.

12.　　 I’d like you _______ (stay) with me tonight.