21. He commanded that all the windows_____before we left.

　 A. should shut　 B. would be shut　 C. would shut　 D. be shut

20. He called me this morning and asked me what_____last night.

　 A. did I do　 B. had I done　 C. I did　 D. I had done

19. I was shocked by the news, _____made me realize what terrible problem we would face.

　 A. that　 B. who　 C. whom　 D. which

18. The girl _____leg was broken in the earthquake was taken to hospital.

　 A. that　 B. which　 C. who　 D. whose

17. It is not who is right but what is right_____is of importance.

　 A. which　 B. it　 C. that　 D. this

16.Allow children the space to voice their opinions____they are different from your own.

　 A. once　 B. even if　 C. ever since　 D. as if

15._____environmental(环境的)damage is done, it takes many years for the　 ecosystem(生态系统)to recover.

　 A. Even if　 B. Ever since　 C. While　 D. Once

14. Where have you been? We____you back much earlier.

　 A. were expecting　 B. are expecting　 C. have expected　 D. expect

13.--Are you still busy?

　 -- Yes, I_____my work and it won't take long.

　 A. just finish　 B. am finishing　 C. have finished　 D. am going to finish

12. While I caused _____ series of problems to you, I didn't mean that on_____purpose.

　 A. the; \　 B. the; a　 C. \; a　 D. a; \