19. Susan started to clean the room; __________Lily was preparing lunch.

A. however　　　　　 B. but　　　　　　 C. meanwhile　　　　　　 D. when

18. Had you joined the caht room ten minutes ago, you would have known what we _______about then.

A. had talked　　　　　 B. have talked　　　 C. talk　　　　　　　　 D. were talking

17.It is too bad for someone in such a high _______ in the government to behave badly in public.

A. position　　　　　 B. situation　　　　　 C. profession　　　　 D. condition

16. ----Why are your hands so dirty?　

-------I ____________in the garden.　

A. was working　　　 B. have worked　　　 C. worked　　　　　 D. have been working

15. If I can help ____, I don’t like working late into the night.

A. so　　　　　　 　　B. that　　　　　　 C. it　　　　　　　　 D. them

14.---Why not open the windows to let _____cool air in?

---I’d rather you didn’t. ________air in out town is terribly polluted.

A. a; The　　　　　　 B. /; The　　　　　　 C. / ;/　　　　　　　　　 D. the; /

13.----Are my clothes too casual?

----No. You can go ____you are.

A. as　　　　　　　　 B. what　　　　　　 C. that　　　　　　　　　 D. where

12. How 　　___　I help them to understand when they won’t listen to me?

　A．can　　　　　　　　　　　　 B．would　　　　　　　　　 C．may　　　　　　　　　　　　 D．must

11.In summer, food will go bad if________in room temperature.

　A．leaving　　　　　　　　　 B．left　　　　　　　　　　　 C．being left　　　　　　　　 D．having left

10.QQ,　　　　 you can chat with your friends, makes communication easy.

A．why　　　　　　　　　　　 B．which　　　　　　　　　 C．that　　　　　　　　　　　　　 D．where