The Education Department says that school safety has set off alarm bells with frequent reports of serious accidents ________ students got injured or killed.
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A
after which
B
in which
C
by which
D
for which
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It was April 29, 2011 _____ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
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A
that
B
when
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since
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The book was written in 1946, ____ the education system has witnessed great changes.
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A
when
B
during which
C
since then
D
since when
Peter was so excited _____he received an invitation from his friend to visit Wuxi.
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where
B
that
C
why
D
when