1 . (2014·兰州高三质检)Our country is developing at an amazing speed，which is________makes me feel so proud.

A．what	B．why
C．that	D．where

2 . —I drove to Zhuhai for the air show last week.
—Is that ________ you had a few days off ?

A．where

B．when

C．what

D．why

3 . Is this research center _________ you met some foreign guests last week?

A．that

B．where

C．which

D．in which