___________ is unknown to me.A.Where he isB.Where is heC.He is whereD.Is he where

A __________ to this problem is expected to be fou

To say something _______ one thing, to do it _____ another.A、is; isB、are; areC、is; areD

____ , the repair in so short a time is unknown to us.A.How they finishedB.How did they fi

It remains unknown whether the rate of cell turnover in diseased hearts____________.

The ______ of the word is unknown, but it is certainly not from Greek.[2001]A．originB．gene

_________(60)A.converts B.is to convertC.is conve