21.You cannot imagine how much I ______ on this dress. Is it beautiful？
A.paid B.took C.cost D.spent
[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 is my cousin, Kate.
A.a B.an C.the D./
[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 farm lands.
A.less and less B.larger and larger C.smaller and smaller D.fewer and fewer
[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
[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 ______everyday.
A.clean B.cleans C.is cleaned D.cleaned
[析]答案为C。句中有everyday，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)
________Lucyusuallycleanthecage？
[剖析]答案为How often does。对every twodays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
[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
[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.We got to the top of the mountain in daybreak. (×)
We got to the top of the mountain at daybreak. (√)
[析]at用于具体时刻之前，如：sunrise,midday,noon,sunset,midnight,night。
30.Don't sleep at daytime. (×)
Don't 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。
