11.He was busily engaged ______ writing letters.
A. on
B. in
C. with
D. by
12.Do remember to ______ the light when you leave the room.
A. turn up
B. turn on
C. turn off
D. turn down
13.The atmosphere consists of an ocean of gases ______ miles high.
A. hundreds
B. hundreds of
C. of hundreds
D. of hundreds of
14.Not only the students but also the old teacher ______ been changed.
A. was
B. were
C. has
D. have
15.—— ________ I had!
—— You really suffered a lot.
A. What a time
B. What time
C. How a time
D. how time
16.The advertisements are trying ________ people to buy things they don‘t really need.
A. persuade
B. persuading
C. be persuading
D. to persuade
17.Practice ________ English every day.
A. speak
B. to speak
C. speaks
D. speaking
18.The discount houses were first established in that period of time ________ people‘s purchasing power was low.
A. which
B. that
C. when
D. where
19.Please write a report ________ the above subjects are to be covered.
A. which
B. in which
C. that
D. in that
20.The reason ________ I‘m writing is to ask for your permission to translate your latest novel into Chinese.
A. because
B. why
C. for
D. as
11.正確答案：B
答案解析：be engaged in：從事，忙于。
12.正確答案：C
答案解析：根據(jù)句意，應(yīng)該選擇“關(guān)閉”。句意：離開房間時(shí)一定記著把燈關(guān)掉。
13.正確答案：B
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(fù)數(shù)形式+of短語”表示的是不確切的數(shù)量。
14.正確答案：C
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(yīng)與the old teacher一致，所以答案是C.
15.正確答案：A
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(dāng)于 What a bad time I had! 這是個(gè)習(xí)慣用語。
16.正確答案：D
答案解析：try to do：試圖做某事。
17.正確答案：D
答案解析：本題考查的是practice后面要跟動詞的ing形式。
18.正確答案：C
答案解析：先行詞是in that period of time，所以關(guān)系詞應(yīng)選擇when.
19.正確答案：B
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.正確答案：B
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(dǎo)詞why表示原因。
