19、It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

    A．that; that              B．that; where         C．when; that         D．when; when

18、It was in the Ming Dynasty __________ the Great Wall was rebuilt to keep out northern tribes _________ threatened the Chinese heartland.

    A．that; that              B．that; where         C．when; that         D．when; when

17、_________ is known to us all is that the old scientist, for ___________ life was hard in the past, still works very hard in his eighties.

    A．As; whom          B．What; whom      C．As; whose         D．What; whose

16、_________ she was sick, I was expected to take her place greatly surprised me, for I didn’t have much work experience.

    A．That if                 B．If                       C．If that              D．That

15、

37、B

38、B

39、C

40、B

14、In the United States, there were 222 people    86        (report) to be billionaires in 2003. The   87      of these is Bill Gates, worth at least $41 billion, who made his money  88  starting the company Microsoft. Mr. Gates was only 21 years old    89     he first helped to set up the company in 1976. He was a billionaire   90     the time he was 31.

13、假设你是一个名叫李英的失学学生，因得到在上海工作的一位美国人Mr. Smith的赞助而重返校园，你想给他写一封信表示感谢。

12、What other ______ _ ________do you know? (濒危物种)

11、Do you have enough e__________（证据）to prove you are right?.

10、 An opportunity has __________(出现).