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21. This washing machine is environmentally friendly because it uses _______ water and electricity than _______ models. (2006北京卷)
A. less; older B. less; elder C. fewer; older D. fewer; elder
【解析】由于water and electricity不可数，所以不能选C和D; 又因为elder只用于人，不用于事物，所以排除B。
22. — When do we need to pay the balance?
— __________ September 30. (2006北京卷)
A. In B. By
C. During D. Within
【解析】by指“在……之前”“到……为止”，又如：He was very tired by the evening. 他到晚上已经很累了。He has read about 40 pages of the book by now. 现在这本书他已读了大约40页。
23. She went to the bookstore and bought _______. (2006北京卷)
A. dozen books B. dozens books C. dozen of books D. dozens of books
【解析】dozens of为习语，其意为“许多”“好几st1:chmetcnv w:st="on" TCSC="1" NumberType="3" Negative="False" HasSpace="False" SourceValue="10" UnitName="”">十”，又如：l said it was a secret but she’s told dozens of people. 我说那是一个秘密，可她告诉了好几十个人。
24. — Which driver was to blame?
— Why, _______! It was the child’s fault, clear and simple. He suddenly came out between two parked cars. (2006北京卷)
A. both B. each C. either D. neither
25. — What’s the name?
— Khulaifi. _______ I spell that for you? (2006北京卷)
A. Shall B. Would C. Can D. Might
【解析】Shall I…? 意为“要我……吗？”，又如：Shall I help you? 要不要我帮你的忙? Do you want a bath at once, or shall I have mine first? 你马上洗澡还是我先洗?
26. — I knocked over my coffee cup. It went right over _______ keyboard.
— You shouldn’t put drinks near _______ computer. (2006北京卷)
A. the; 不填 B. the; a C. a; 不填 D. a; a
27. — _______ leave at the end of this month.
— I don’t think you should do that until _______ another job. (2006北京卷)
A. I’m going to; you’d found B. I’m going to; you’ve found
C. I’ll; you’ll find D. I’ll; you’d find
【解析】第一空用be going to表示打算或意图，第二空用现在完成时暗示对方应该“先找到新工作，然后再辞职”。注：第二空若不用现在完成时，用一般现在时也可以。
28. There have been several new events _______ to the program for the 2008 Beijing Olympic Games. (2006北京卷)
A. add B. to add C. adding D. added