[单选题]Do you know the man ( ) ?

[单选题]We’ve all heard of Thomas Edison, ( ) invented the electric light and many other things.

[单选题]You can only be sure of ( ) you have at present. You cannot be sure of something ( ) you might get in the future.

[单选题]Great changes have taken place since then in the school ( ) we are studying.

[单选题]The engineer ( ) my father works is about 50 years old.

[单选题]He is good at singing, ( ) we all know.

[单选题]Jack, ( ) to the concert enjoyed it very much.

[单选题]Last week we visited the Summer Palace, ( ) Beijing is famous in the world.

[单选题]This is the reason ( ) he didn’t come to the meeting.

[单选题]The girl ( ) an English song in the next room is Tom’s sister.

[单选题]They arrived at a farmhouse, in front of ( ) sat a small boy.

[单选题]Global warming has become a serious problem, ( ) we must find solutions.

[单选题]I want to use the same dictionary ( ) was used yesterday.

[单选题]He isn’t such a man ( ) he used to be.

[单选题]She showed the visitors around the museum, the construction ( ) had taken more than three years.