(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.
#30425
A
while
B
when
C
as
D
before
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Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
#33567
A
while
B
or
C
for
D
so
Is it the country ________ you studied ________ you are going to visit next week?
#33526
A
in which; which
B
where; that
C
that; that
D
where; where
—I wonder how much you charge（要价） for your services.—The first two are free the third costs￥30.
#31319
A
while
B
until
C
when
D
before
I took my driving license with me on holiday, _______ I wanted to hire a car.
#30912
A
in case
B
even if
C
ever since
D
if only