第二部分：单项填空（共15小题；每小题1分，满分15分）
21. Mr Brown stood up in defense of the 16-year-old boy, saying that he was not the one ________.
A. blamed B. blaming C. to blame D. to be blamed
22. The girl looked at me with a _____ expression. Maybe the problem was quite ________ .
A. puzzled; puzzling B. puzzling; puzzled
C. puzzled; puzzled D. puzzling; puzzling
23. Ladies and gentlemen, now I will ________ the story where I finished the day before yesterday.
A. keep up B. take up C. keep on D. go on
24. Only after they had discussed the matter for several hour ___ a decision.
A. they reached B. do they reach
C. they reach D. did they reach
25. ________ the reasons above, I found I was paying too much attention to the job.
A. Apart from B. Except C. Beyond D. In addition
26. You should understand the traffic rule by now. You’ve had it _____ often enough.
A. explain B. explaining C. explained D. to explain
27. People have always been curious___ how living things on the earth exactly began.
A. in B. about C. of D. at
28. Up ___ into the air, then the crowd cheered up.
