1）a great number of________  2)许多名胜古迹 ____________ 3) fetch sb. sth._______  

4) the second longest__________ 5）Anything else?_______

1)It’s been two years since Mr. and Mrs. Green came to China.

2)China is a great country that has about 5000years of history.

3)There are many places of interest which attract millions of tourists from all over the world every year.

4）It’s a book which introduces China in detail.

知识点拨：定语从句：定语从句在句子中修饰一个名词或代词，其作用相当一个形容词。被修饰的词叫先行词，引导定语从句的词叫引导词，分关系代词和关系副词。引导词的作用一是放在先行词与定语从句中间起连接作用，二是在从句中充当一个成分，并与先行词保持数的一致。（1）、常用that引导的定语从句：that可以指人也可指物，在从句中作主语或宾语。作主语是不能省略，作宾语是可省略。（2）、常用which引导的定语从句：which指物，在从句中作主语或宾语。作主语是不能省略，作宾语是可省略。（3）、常用who引导的定语从句: who指人，在从句中作主语。(4)whom指人，为who的宾格形式，在句子中只能作宾语。其前面没有介词时，也可用who\that代替，也可省略。

1)The book_______I gave you was worth 50 yuan

2）A plane is a machine _____can fly

3）Do you know the man ______is talking with your mother?

4）The students _____are from Hunan Province are excellent

5）The girl _______ I like isn’t here now.