21. I hope, first of all, that we shall never lose_______ heart in ______face of failure.
A. the / the B. a/ the C. our / 不填 D. 不填 / 不填
22. ----I’m taking my final exam the day after tomorrow.
---- ________.
A. Cheers B. Good luck C. Come on D. Congratulations
23. Because the dam ________, all the villagers will remove to a safer place..
A. has taken apart B. took apart
C. is taking apart D. had taken apart