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(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
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A
while
B
when
C
as
D
before
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We won’t give up ________ we should fail ten times.
#31020
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even if
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unless　　　
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whether
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　　　James was sleepy, he stayed up late to finish his project.
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for
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We won’t give up _______ we should fail ten times.
#79781
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even if
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since
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On a rainy day I was riding my bike to pick up my son ___ a terrible accident happened ahead.
#31616
A
who
B
which
C
while
D
when