1.—Someone wants you on the phone.
—________ nobody knows I am here.
A. Although B. And
C. But D. So
[解析]句意：——有人打电话找你。——可是没人知道我在这儿呀。本题考查连词。由答语 nobody knows I am here 可知，上下文句子间为转折关系，故答案为C项。
[答案]C
2.It was a nice meal, ________ a little expensive.
A. though B. whether
C. as D. since
[解析]句意：尽管有点贵，但还是不错的一餐。本题考查连词。A：尽管，虽然;B：是否;C：因为，尽管，但作“尽管”讲时，常用倒装结构;D：既然，自从。由语境中两个关键词 nice 和 expensive 可得知，这里表示转折。故选A。
[答案]A
3.Find ways to praise your children often, ________ you'll find they will open their hearts to you.
A. till B. or
C. and D. but
[解析]句意：设法常常表扬你的孩子们，这样你就会发现他们会向你敞开心扉。本题考查并列连词。从句意连贯判断应用 and 表顺承关系。
[答案]C
4.He had his camera ready ________ he saw something that would make a good picture.
A. even if B. if only
C. in case D. so that
[解析]句意：他准备好了照相机，以防看到他能够拍下来的好画面。A项意为“尽管，即使”;B项意为“只要”;C项意为“以防，万一”;D项意为“为了”。
[答案]C
5. ________ regular exercise is very important, it's never a good idea to exercise too close to bedtime.
A. If B. As
C. Although D. Unless
[解析]句意：尽管定时锻炼很重要，但临睡前锻炼绝不是个好主意。本题考查状语从句的用法。although 虽然……但是;if 如果;as 由于，因为;unless 如果不。依句意可知C项正确。
[答案]C
6.Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.
A. whenever B. however
C. whichever D. wherever
[解析]句意：请现在或在你方便的时候打电话告诉我的秘书下午安排一个会议。本题考查状语从句。根据题中的 this afternoon 以及 or 可知设空处应该和时间有关，故答案为A项。
[答案]A
7.________ all of them are strong candidates, only one will be chosen for the post.
A. Since B. While
C. If D. As
[解析]句意：尽管他们都是(实力)很强的候选人，但只有一人将入选这个职位。本题考查连词。since 既然;while 尽管;if 如果;as 当……时候。根据句意应选择B项。
[答案]B
8.________ volleyball is her main focus, she's also great at basketball.
A. Since B. Once
C. Unless D. While
[解析]句意：尽管她把重点都放在排球上，可她也擅长篮球。本题考查连词。根据句意应选择D项。这里 while 引导让步状语从句。
[答案]D
9.It was April 29,2011 ________ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
A. that B. when C. since D. before
[解析]句意：2011年4月29日，英国威廉王子和凯特·米德尔顿走入婚姻殿堂。本题考查状语从句。根据句意可知设空处引导时间状语从句，故答案为B项。本题易误选A项，认为本题考查强调句型，如选A项，需在 April 29,2011前加上介词 on。
[答案]B
10.One Friday，we were packing to leave for a weekend away ________ my daughter heard cries for help.
A. after B. while
C. since D. when
[解析]句意：一个周五，我们正在打包要出去度周末，这时我女儿听到有人求救的声音。本句考查“be doing... when... (正在做……这时……)”这一结构，在本结构中，when 是并列连词，表示“这时”的意思，相当于 and at that time。
[答案]D
11.It sounds like something is wrong with the car's engine. ________， we'd better take it to the garage immediately.
A. Otherwise B. If not
C. But for that D. If so
[解析]句意：汽车的发动机听上去好像出了问题。如果这样的话，我们最好马上把车开到修理厂。if so 假如这样的话，符合题意，所以选D。otherwise 否则;if not 如果不……;but for that 要不是那样的话，均不符合句意。
[答案]D
12.Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.
A. as if B. in case
C. while D. though
[解析]句意：杰克没说什么，但是老师向他微笑，好像他之前做的是明智之举似的。考查状语从句的用法。in case 以防;while 然而;though 尽管，以上三项都不符合句意，故选A项。
[答案]A
13. No matter how ________， it is not necessarily lifeless.
A. a desert may be dry B. dry a desert may be
C. may a desert be dry D. dry may a desert be
[解析]句意：无论沙漠可能会多么干燥，那里也未必没有生命。本题考查让步状语从句。“no matter how+形容词/副词+主语+谓语”构成让步状语从句。四个选项中只有B项符合要求。
[答案]B
14.He had no sooner finished his speech ________ the students started cheering.
A. since B. as
C. when D. than
[解析]句意：他刚做完演讲，学生们就开始欢呼起来。本题考查固定句式。no sooner 往往与 than 连用，意为：一……就……。故答案为D项。
[答案]D
15.To show our respect，we usually have to take our gloves off ________ we are to shake hands with.
A. whichever B. whenever
C. whoever D. wherever
[解析]句意：为了表示我们的敬意，无论我们与谁握手，通常都要摘掉手套。本题考查状语从句的用法。设空处后 we are to shake hands with 后缺宾语，故排除B、D两项;shake hands with 的宾语应为“人”，故排除A项;whoever=no matter who意为：无论谁。
[答案]C
16.Frank insisted that he was not asleep ________ I had great difficulty in waking him up.
A. whether B. although
C. for D. so
[解析]句意：尽管我费了好大周折才把 Frank 弄醒，他却坚持说自己没有睡着。考查状语从句。用 though/although 引导让步状语从句，表示“尽管，虽然”。A：是否;C引导原因状语从句;D引导并列句，表示“因此”，都不符合句意。
[答案]B
17.As is reported，it is 100 years ________ Tsinghua University was founded.
A. when B. before
C. after D. since
[解析]句意：据报道，自从清华大学成立已经有100年了。考查状语从句。这里用句式“It be+一段时间+since引导的状语从句”表示“自从……(到现在)有多长时间了”。
[答案]D
18. If a lot of people say a film is not good, I won't bother to see it, or I'll wait ________ it comes out on DVD.
A. whether B. after
C. though D. until
[解析]句意：如果很多人都说一部电影不好，我就不会去(电影院)看，或者我会等到它的DVD出版。考查状语从句。由句意可知D为正确答案。
[答案]D
19.The police officers in our city work hard ________ the rest of us can live a safe life.
A. in case B. as if
C. in order that D. only if
[解析]句意：我们市里的警方官员们努力工作是为了让我们能过安全的生活。A：以防，万一;B：好像;C：为了，以便于;D：只要。分析句意可知C项为正确答案。
[答案]C
20.Mary made coffee ________ her guests were finishing their meal.
A. so that B. although
C. while D. as if
[解析]句意：客人们就要吃完饭的时候，玛丽去煮咖啡了。本题考查连词。so that 以便，为了，用来引导目的状语从句或结果状语从句。although 虽然，尽管，用来引导让步状语从句。while ①在……期间，当……的时候，用来引导时间状语从句;②然而，而(=but)，表示对比。as if(=as though)仿佛，好像，用来引导方式状语从句。从句意可知C项正确。
[答案]C
