Thinking ______ you know_______ in fact you don’t is a terrible mistake. 
#67852
A
that; that
B
what; what
C
that; what
D
what that
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This is the only one of the books on space ___.
#71605
A
that has been written
B
that have been written
C
which have been written
D
which has been written
Not until he left home ______ to know _______ important the family was for him.
#68340
A
did he begin; what
B
had he begin; how
C
did he begin; how
D
had he begin; what