____ is important that we should study hard.
A. It
B. This
C. That
D. What
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____ doesn't matter what he says.
A. It
B. This
C. That
D. Which
Is ____ necessary to tell his father everything?
A. that
B. it
C. what
D. this
____ is quite clear that he has read the book.
A. This
B. That
C. It
D. He
____ is known to us all that the earth turns around the sun.
As
B. Which
C. That
D. It
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