To make the air clean，Beijing will close some companies________cause heavy pollution．
A．that
B．who
C．what
(2013湖北黄石)This is the school________we visited last year．
A．that
B．where
C．who
D．whose
I want to go to some places________it’s cool in summer．
A．those
B．which
C．where
D．this
All________they have done is good for us．
A．what
B．which
C．why
D．that
Look!The boy________name is Simon is playing soccer with his friends．
A．who
B．whose
C．which
D．whom
(2013湖北荆门)She is the girl________invention got the first prize in the school competition．
A．who
B．that
C．which
D．whose
