1 . 8. 15 is a special number, _________, I think, that will be remembered by the Chinese people forever.

A．what

B．it

C．which

D．one

2 . Is this secondary school ______ we visited last month?

A．the one

B．in which

C．what

D．that

3 . The speed of communications today, as opposed to ____ _of yesterday, has greatly changed the manner in which business today is conducted.

A．one	B．those
C．that	D．these

4 . Mr. and Mrs. Scott prefer a trip in a small town to         in so large a city as New York．

A．this

B．one

C．it

D．that