As we all know ______ medical examination will help us find out health problems as early as possibl

The survival of civilization as we know it is ___

The survival of civilization as we know it is ____

To be a grown－up, it means we know all of the following EXCEPT______.A．what we"re good atB

All we know about the origin of language is that men, unlike animals, ______ invented cert

______ we all know air is gas.A.AsB.WhichC.ThatD

As we know the most important _________ of television companies is profit.