1 . As far as I ________ , the questions ________ the future of the company is worth discussing.

A．am concerned; concerning	B．am concerned; concerned
C．concerned; concerning	D．concerned; concerned

2 . Richard was called in by the police to answer questions          the disappearance of Thomas Riley, whose relatives were           his present situation.

A．concerning; concerning about	B．concerning; concerned about
C．concerned；concerning about	D．concerned; concerned about