21. You can not imagine how much I ______ on this dress. Is it beautiful？
A. paid B. took C. cost D. spent
[剖析] 答案为D。本题考察四个表"花费"的动词辨析。主语为人，且和介词on搭配的动词是spend。
22. ---- Do you know _____ university student who is talking with Joe？---- Yes， she，s my cousin, Kate.
A. a B. an C. the D. /
[剖析] 答案为C。university虽然以元音字母u开头，但其前若使用不定冠词时，则要用a.不过此题中不能使用不定冠词，而是特指和Joe说话的那个大学生，故要选the。
23. The number of giant pandas is getting ______ because their living areas are becoming farmlands.
A. less and less B. larger and larger C. smaller and smaller D. fewer and
fewer
[剖析] 答案为C。句意为"大熊猫的数量越来越少因为他们的生存空间正逐渐变成农场"。本题中四个选项都是"比较级+ and + 比较级"的结构，表示"越来越……"。主语为number，只能和large或small搭配。而结合句意可判断答案为C。
24. Be careful when you come _______ the street，because the traffic is very busy
at the moment.A. across B. behind C. between D. over
[剖析] 答案为A。本题考察方位介词的用法。"过马路"一般为表面横穿，因此要用across。
25. ---- Do you often clean your classroom？---- Yes, our classroom ______ every day.
A. clean B. cleans C. is cleaned D. Cleaned
[剖析] 答案为C。句中有every day，主语为our classroom，故要用一般现在时的被动语态。
26. Lucy usually cleans the cage every two days. （对画线部分提问）_ _______ Lucy usually clean the cage？
[剖析] 答案为How often does。对every two days提问要用how often。
27. I didn't understand __________，so I raised my hand to ask...
A. what my teacher says B. what does my teacher say C. what my teacher said D. what did my teacher say
[剖析] 答案为C。本题为宾语从句，由于需要用陈述语序可排除B、D；另外，主句时态为一般过去时，则从句也要用对应的过去时态，故还可排除A。
28. ---- How much ______ the shoes？ ---- Five dollars ______ enough.
A. is；is B. are；is C. are；are D. is；are
[剖析] 答案为B。shoes作主语时，谓语动词应用复数形式；five dollars是一个整体，应按单数对待。
29. 误〕 We got to the top of the mountain in daybreak. 〔正〕 We got to the top of the mountain at day break.
〔析〕 at用于具体时刻之前，如：sunrise, midday, noon, sunset, midnight, night。
30. 〔误〕 Dont sleep at daytime 〔正〕 Dont sleep in daytime.
〔析〕 in 要用于较长的一段时间之内，如：in the morning / afternoon, 或 in the week / month / year. 或 in spring / supper /autumn / winter等等。