21. You can not imagine how much I ______ on this dress. Is it beautiful?

　　A. paid B. took C. cost D. spent

　　[剖析] 答案為D。本題考察四個表"花費"的動詞辨析。主語為人，且和介詞on搭配的動詞是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] 答案為C。university雖然以元音字母u開頭，但其前若使用不定冠詞時，則要用a.不過此題中不能使用不定冠詞，而是特指和Joe說話的那個大學(xué)生，故要選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] 答案為C。句意為"大熊貓的數(shù)量越來越少因為他們的生存空間正逐漸變成農(nóng)場"。本題中四個選項都是"比較級+ and + 比較級"的結(jié)構(gòu)，表示"越來越……"。主語為number，只能和large或small搭配。而結(jié)合句意可判斷答案為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] 答案為A。本題考察方位介詞的用法。"過馬路"一般為表面橫穿，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] 答案為C。句中有every day，主語為our classroom，故要用一般現(xiàn)在時的被動語態(tài)。

　　26. Lucy usually cleans the cage every two days. (對畫線部分提問)_ _______ Lucy usually clean the cage?

　　[剖析] 答案為How often does。對every two days提問要用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] 答案為C。本題為賓語從句，由于需要用陳述語序可排除B、D;另外，主句時態(tài)為一般過去時，則從句也要用對應(yīng)的過去時態(tài)，故還可排除A。

　　28. ---- How much ______ the shoes?　---- Five dollars ______ enough.

　　A. is;is B. are;is C. are;are D. is;are

　　[剖析] 答案為B。shoes作主語時，謂語動詞應(yīng)用復(fù)數(shù)形式;five dollars是一個整體，應(yīng)按單數(shù)對待。

　　29. 誤〕 We got to the top of the mountain in daybreak. 〔正〕 We got to the top of the mountain at day break.

　　〔析〕 at用于具體時刻之前，如：sunrise, midday, noon, sunset, midnight, night。

　　30. 〔誤〕 Dont sleep at daytime 〔正〕 Dont sleep in daytime.

　　〔析〕 in 要用于較長的一段時間之內(nèi)，如：in the morning / afternoon, 或 in the week / month / year. 或 in spring / supper /autumn / winter等等。

　　31. 〔誤〕 He became a writter at his twenties 〔正〕 He became a writter in his twenties

　　〔析〕這句話應(yīng)譯為：他在20多歲時就成了作家。在某人的一段生活時間段中要用介詞in來表示，而在具體歲數(shù)時用at來表示。

　　32. 誤〕 We went to swim in the river in a very hot day. 〔正〕 We went to swim in the river on a very hot day.

　　〔析〕 具體某一天要用介詞on, 又如：on New Years Day

　　33. 〔誤〕 Im looking forward to seeing you on Christmas. 〔正〕 Im looking for ward to seeing you at Christmas.

　　〔析〕在節(jié)日的當(dāng)天用on，而全部節(jié)日期間用at,Christmas是圣誕節(jié)期間，一般要有兩周或更長的時間。

　　34. 誤 I havent see you during the summer holidays. 正 I havent seen you since the beginning of the summer holidays. 〔析〕 during表示在某一段時間之內(nèi)，所以一般不與完成時搭配，如：I visited a lot of museums during the holiday. 而for表示一段時間，可以用于完成時，如：I havent see you for a long time. 而through 用來表示時間時則為"整整，全部的時間"。如：It rained through the night.而since則是表達(dá)主句動作的起始時間，一般要與完成時連用。

　　35. 〔誤〕 At entering the classroom, I heard the good news. 〔正〕 On entering the classroom, I heard the good news. 〔析〕 On 加動名詞表示"一……就"。本句的譯文應(yīng)是：我一進(jìn)入教室就聽見這個好消息了。又如：on hearing… 一聽見， on arrival 一到達(dá)就……(on表示動作的名詞)

　　36. 〔誤〕 In the beginning of the book, there are some interesting stories. 〔正〕 At the beginning of the book, there are some interesting stories. 〔析〕 at the begining與at the end都是指某事物的開始與結(jié)束部分，均不指時間范圍，而in the beginning 則是指開始一段時間。in the end=at last是指"最終，終于"之意。

　　37. 〔誤〕 Till the end of next week. I will have finished this work. 〔正〕 By the end of next week. I will have finished this work. 〔析〕 by 引起的時間狀語表示了動作的截止點，其意思為"不遲于某一時刻將工作做完"，所以主句一般是完成時態(tài)。當(dāng)然可以有將來時態(tài)，如：Ill be there by five oclock.而till則表達(dá)其一動作一直持續(xù)到某一時刻，但句中的動詞一定要用持續(xù)性動詞，而瞬間的截止性動詞應(yīng)用其否定句式，如：I wont finish this work till(until) next weekend.

　　38. 〔誤〕 He came to London before last weekend. 〔正〕 He had come to London before last weekend.

　　〔正〕 He came to London two weeks ago. 〔析〕 before 一般要與完成時連用，而ago則與一般過去時連用。

　　39. 〔誤〕I have studied English for three years gince I had come here.正 I have studied English for three years since I came here. 析 since用來表達(dá)主句動作的開始時間，所以其引出的從句中應(yīng)為過去時，而不能用完成時態(tài)

　　40. 〔誤〕 I can help you repair this bike. You will get it after two hours. 〔正〕 I can help you repair this bike. You will get it in two hours. 〔析〕中文經(jīng)常講兩小時之后來取，兩天內(nèi)會修好，而這個介詞在英文中要用in而不要用after。其原因有二，①after 多用于過去時，如：I arrived in New York. After three days, I found a job in the bank. ② after 加時間是表達(dá)一個不確定的時間范圍，如：after three days, 即三天之后的哪一天都可以。所以在許諾若干時間內(nèi)會完成某事時，一定要用介詞in。