11.He was busily engaged ______ writing letters. 【 B 】

　　A. on

　　B. in

　　C. with

　　D. by

　　【答案解析】：be engaged in：從事，忙于。

　　12.Do remember to ______ the light when you leave the room. 【 C 】

　　A. turn up

　　B. turn on

　　C. turn off

　　D. turn down

　　【答案解析】：根據(jù)句意，應該選擇“關閉”。句意：離開房間時一定記著把燈關掉。

　　13.The atmosphere consists of an ocean of gases ______ miles high. 【 B 】

　　A. hundreds

　　B. hundreds of

　　C. of hundreds

　　D. of hundreds of

　　【答案解析】：譯文：大氣由上百英里高的氣體組成�！癶undred，thousand等數(shù)詞的復數(shù)形式+of短語”表示的是不確切的數(shù)量。

　　14.Not only the students but also the old teacher ______ been changed. 【 C 】

　　A. was

　　B. were

　　C. has

　　D. have

　　【答案解析】：not only…but also…是固定搭配，意思是：不但……而且……。它需要遵循就近原則，謂語動詞應與the old teacher一致，所以答案是C.

　　15.—— ________ I had!

　　—— You really suffered a lot. 【 A 】

　　A. What a time

　　B. What time

　　C. How a time

　　D. how time

　　【答案解析】：感嘆句分兩類：

　　1.What + n.+主謂部分2.How + adj. / adv. / v.+主謂部分。本題屬第一種，但省略了bad，相當于 What a bad time I had! 這是個習慣用語。

　　16.The advertisements are trying ________ people to buy things they don‘t really need.【 D 】

　　A. persuade

　　B. persuading

　　C. be persuading

　　D. to persuade

　　【答案解析】：try to do：試圖做某事。

　　17.Practice ________ English every day. 【 D 】

　　A. speak

　　B. to speak

　　C. speaks

　　D. speaking

　　【答案解析】：本題考查的是practice后面要跟動詞的ing形式。

　　18.The discount houses were first established in that period of time ________ people‘s purchasing power was low. 【 C 】

　　A. which

　　B. that

　　C. when

　　D. where

　　【答案解析】：先行詞是in that period of time，所以關系詞應選擇when.

　　19.Please write a report ________ the above subjects are to be covered. 【 B 】

　　A. which

　　B. in which

　　C. that

　　D. in that

　　【答案解析】：in which the above subjects are to be covered是report的定語從句。which指代先行詞report，in用于與report搭配。

　　20.The reason ________ I‘m writing is to ask for your permission to translate your latest novel into 　Chinese. 【B 】

　　A. because

　　B. why

　　C. for

　　D. as

　　【答案解析】：本題考查的是定語從句的用法。先行詞是the reason;引導詞why表示原因。