It will take a whole day ____ the top of the mountain on foot.
A. to get to
B. get to
C. getting to
D. got to
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____ is important that we should study hard.
A. It
B. This
C. That
D. What
____ 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
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