更正楼上两位若干错误（尤其是第25/28题），准确答案如下：
21. hears from
22. as/so, as
23. cheap enough
24. had fun 或 enjoyed themselves
25. a week
26. seldom/hardly, after
27. easy enough
28. If, don't
29. attracts interest from
30. flew
31. except
32. in
33. prefers
34. Nobody
注：/ 表示可以任意选用其一。
1,hears from 2as as 3cheap enough 4had fun 5the date 6never after 7easy enough 8if arenot(缩写） 9attracts interest from 10flew 11except 12in 13prefers 14nobody
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