It was not until ten o'clock ____ he went to bed.
A. when
B. which
C. that
D. how
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It was yesterday ____ I met Li Ming at the railway station.
A. when
B. which
C. how
D. that
It was in the street ____ I met him last week.
A. where
B. that
C. who
D. which
It was Peter ____ answered the question.
A. who
B. which
C. what
D. whose
____ was this problem that a young scientist solved two years ago.
A. This
B. That
C. It
D. He
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