______ is known to us all , the old scientist,______ life was hard in the past, still works hard in his eighties.

     A. It; whom          B.As; whom     C. As; whose          D. What; whom

_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

A.     As; whom  B. What; whom   C. It; whose  D. As; whose

_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

A.     As; whom  B. What; whom   C. It; whose  D. As; whose

_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.?

A. It; whom?????? B. As; whose????????????? ???? C. As; whom????? ????????????? D. It; whose

_____ is known to us all is that the old scientist, for _____ life was hard in the past, still works very hard in his eighties.

A. As; whom          B. What; whom             C. It; whose                  D. As; whose