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二、单选 21. Students should be encouraged to use ____Internet as ____resource. A. 不填; a B. 不填; the C. the; the D. the; a 22. He found it increasingly difficult, _____his eyesight was beginning to fail. A. though B. for C. but D. so 23. _______was most important to her, she told me, was her family. A. It B. This C. What D. As 24. Thank you for all your hard work last week. I don’t think we _____ it without you. A. can manage B. could have managed C. could manage D. can have managed 25. By the time he realizes he ____into a trap, it’ll be too late for him to do anything about it. A. walks B. walked C. has walked D. had walked 26. Occasions are quite rare ____I have the time to spend a day with my kids. A. who B. which C. why D. when 27. Make sure you’ve got the passports ad tickets and ____before you leave. A. something B. anything | 
