1 . Almost everyone has his own strengths and weaknesses. It is           others are weak that maybe you have a great advantage.

A．as

B．where

C．that

D．what

2 . Although he has become wealthy, Mr. Wood remains _________ he used to be ,modest and friendly .

A．which

B．where

C．what

D．that

3 . He is going to build a team that has a lot of potential and he thinks that is excites him.

A．that

B．which

C．what

D．as

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

A．that

B．where

C．which

D．in which