28. -Where have you been all day?

　 　-I _______ some former classmates and I couldn’t get back until it was dark.

　 　A. have met　　　　　 　B. met　　　　　　 　C. would meet　 　D. had met

27. The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.

　 A. even if 　　　　　 　　　　B. as long as　　　　　　　 　 　 C. as if　　　 　　　 　　D. as soon as

26. -How much of the foreign expert’s speech have you understood?

　 　-Next to nothing. I wish I _______ harder at English.

A. worked　　　　　 　　　　　　　　 B. had worked　 　　　 　　　 C. would work 　　　 D. were working

25. Don’t refer to the dictionary every time you come across a new word as sometimes its meaning may be _______ clearly in a given context.

　 　A. picked out　　　　　 B. ruled out　　　　　　　　　　　 C. brought out　　　　　 D. taken out

24. The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.

　 　A. adoptable　　　　　　　　　　　　　　 B. acceptable　　　　　 C. available　　　　　　　　　　　 D. accessible

23. Knowing office rules- whether _______ or not-is critical, especially for young job seekers.

　 　A. written　　　　　　　　　　　　　　　　 B. writing　 　C. being written　　　　 D. having been written

22.-He is eager to try something he has never tried before.

　　-Oh, I see. That’s _______ he’s different from others.

A. when　　　 　　　　　B. where　　　　　　　　　　　　　　 C. how　　　 D. what