____ is known to us all that the earth turns around the sun.
As
B. Which
C. That
D. It
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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
It was at yesterday's meeting ____ I misunderstood what you had said.
A. where
B. which
C. who
D. that
It is Tom ____ often helps me with my English.
A. what
B. who
C. which
D. whose
It was at 3 o'clock ____ they received the phone.
A. what
B. that
C. which
D. when
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