20. --May I borrow this dictionary ? ---Sorry. This is not _____. It’s Lily’s .　

A. my　 B. mine　 C. her　 D. yours

19. The teacher is speaking . Please stop _____ and listen to him.

A. talking　 B. to talk　 C. talks　 D. talked

18. - Sorry, Mr. Green. Jim can't take part in the relay race because he's ill.

　- It doesn't matter. I'll ask ___ to go instead of him.

A. somebody else　 B. anybody else　 C. everybody else　 D. nobody else

17. ---Why did _____ take Aunt Alice almost an hour to get home ?

　 ---I don’t know . Maybe there was something wrong with her car .　

A. that　 B. it　 C. she　 D. this

16. ---I’m sorry ,Mr.Wang. I _____ my homework at home .

---That’s OK. But don’t forget ____ it to school tomorrow.

A. forget , to take　 B. left , to bring　 C. forgot , to bring　 D. left , to take

15. ---Can you go swimming with us this afternoon?

---Sorry, I can’t. I ____ take care of my little sister at home because my mother was ill

A. can　 B. may　 C. would　 D. have to