5. A high public tolerance for - and low public awareness of - noise pollution has provided bus video advertisers with a paradise ______ their businesses.

A. in which to expand　　　　　　 B. which to expand in

C. where to expand　　　　　　　 D. that they expand in

4. ____ is known to everybody, the moon travels round the earth once every month.

A. It　　 B. As　　　 C. That　　 D. What

3. We will be shown around the parks, schools and some places of interest, _____ other tourists often go.

A. what　　 B. which　　 C. where　　 D. when

2. She brought with her three friends, none of ________ I had ever met before.

A. them　　　 B. who　　　 C. whom　　　　 D. these

1. Is this radio the one you would like ____?

A. to have it repaired 　　B. to have repaired 　

C. to repair it　　　　　 D. have it repaired

5、不能用that的情况：

1)在非限制性定语从句中：

Beijing, which is the capital of China, is a very beautiful city.北京是一个非常美丽的城市，它是中国的首都。

2)定语从句由“介词+关系代词”引导，先行词是人，关系代词用whom; 先行词是物，关系代词用which.

The person at whom the boys are laughing is John’s father. 那个被男孩子们取笑的人是约翰的父亲。

The thing about which he is talking is very important. 他们正在谈论的事情很重要。

上面两个句子，如果把介词放在laughing, talking之后，关系代词仍然可用that.

在这类句式中，如果是含有介词的短语动词，就不能把介词提前，只能放在原来的位置上。例如：

Is this the knife which you are looking for? 这是你在寻找的刀子吗？

He is the old man whom Mary has taken care of for a long time. 他就是玛丽照顾了很久的那位老人。

3)注意关系代词which, whom作介词of的宾语时的结构。

They are having a meeting, the importance of which is known to everybody. 他们正在开会，会议的重要性是众所周知的。

There are over 2000 students in this school, sixty per cent of whom are boys. 这个学校有2000多名学生，百分之六十是男孩。

[典型例题]

4、只能用that的情况：

1)先行词是不定代词all, few, little, much, something, nothing, anything等。

All that we have to do is to practice every day. 我们要做的就是每天练习。

2)先行词被all, any, every, each, few, little, no, some等修饰。例如：

Ask any question that you don’t understand. 提问任何你们不懂的问题。

3)先行词被序数词或形容词的最高级所修饰。例如：

This is the most beautiful place that I have ever visited. 这是我参观过的最美丽的地方。

4)先行词被the only, the very修饰时。例如:

He is the only foreigner that has been to that place. 他是去过那个地方的唯一的一个外国人。

5)先行词既有人又有物时。例如：

They talked of things and persons that they remembered in the school. 他们谈论着他们能记得的那些在学校的人和事。

3、关系代词which和as 在定语从句中的区别：

1)as作关系代词，代指整个主句；而which在非限制性定语从句中既可以修饰整个主句，又可以修饰主句的一部分。

He is a good doctor, which is true. 他是一个好医生，确实是这样。(修饰整个主句)

She was very strict with her child, which her husband seldom was. 她对孩子很严格，而她丈夫却很少这样。(which 代指strict with her child)

Don’t call between 12 o’clock and 1 o’clock, at which time I’m usually having lunch. 别在12点和1点之间打电话，那个时候我通常正在吃午饭。

I told him to go to a doctor, which advice he took. ( which= and this ) 我告诉他去找大夫，他听了这个劝告。

She is studying economics, which knowledge is very important today. 她在学习经济学，这个知识今天非常重要。

2) which不能放在句首，而as则可以。

3) as有“正如、就像”之意，而which则没有。

4)which 可用作表语。既可以指人，又可以指物；指人时，一般指从事某种职业的或是有特性、品质或才能的人。

The modern car is no longer the car which it was in 1930’s.　 现代汽车不再是20世纪30年代的车了。

He will become the man which his father wants him to be. 他将成为父亲所期望的人。

She looks like a Russian, which you are not. (= She looks like a Russian, while you are not like a Russian.)

2、As 的用法：

1)As用作关系代词和关系副词引导限制性定语从句，并在从句中作主语、宾语、表语或状语，构成the same … as …, such …as …等结构。例如：

　 　　　　We should publish such good books as will help the young people grow healthily. 我们应当出版这样的帮助年轻人健康成长的好书。

　　 　　　Pollution is such a big problem as concerns the whole mankind. 污染是关系到全人类的大问题。

　　　 I like the same book as you do. 我和你喜欢同样的书。

Such students (Students such) as you have mentioned should be criticized. 你提到的那种学生应该受到批评。 　 I shall do it (in) the same way as you did. ( as 为关系副词，作状语。) 我也该用和你同样的方法做这件事。

2)As 引导非限定性定语从句，as 在定语从句中作主语或宾语，这个定语从句用来说明整个主句，它可以放在主句之前。例如：

As is known to all, he is the best student in our class. 大家都知道，他是我们班最好的学生。

As we all know, he studies very hard. 正如我们所知道的，他学习很刻苦。

3)常用的这种类似插入语的句式还有:　 As it said above “如上所述”。As it is “按照现状 “ As is often the case “这是常事；正如经常发生的一样”。As it were “似乎、好像、仿佛、可以说”

1、先行词way后的定语从句可用in which引导,也可以用that引导, 也可以省略，不要关系代词或关系副词。

That is the way I look at it. 这就是我对这件事的看法。

That was the way she looked after us. 她就是这样照顾我们的。

The way he talked reminded us of his grandfather. 他讲话的样子使我们想起了他的祖父。