____ doesn't matter what he says.
A. It
B. This
C. That
D. Which
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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
It was not until last July ____ we started to distribute e-readers and launched an e-book store.
A. that
B. when
C. which
D. who
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