The professor________ the perfect return of Shenzhou 7 in 2008______ “the most exciting thing in history” in his speech.
| A．referred to; for | B．referred; as |
| C．referred to; as | D．referred; for |
27. How can you expect him to make any progress ____ you never give him a chance to have a try?
| A．when | B．unless | C．even though | D．until |
26. They got married 30 years ago and never ______ in the past years.
| A．they didn’t quarrel | B．they have quarreled |
| C．did they quarrel | D．have they quarreled |
25. The student who was caught ______ in the exam has been removed from school.
| A．cheat | B．cheated | C．cheating | D．to cheat |
24. ---Is there any flight to New York?
--- I think there ______ be, for it is snowing so heavily.
| A．shouldn’t | B．mustn’t | C．can’t | D．needn’t |
23. We have no idea at all ______the economic crisis will end.
| A．when | B．that when | C．what | D．That |