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
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I have kept the photo I can see it easily, as it reminds me of my happy childhood in the countryside.
#32035
A
in which
B
when
C
where
D
that
—What do you think of it?—Well，it’s worth doing ________ the result is satisfactory.
#30224
A
the moment
B
as soon as
C
once
D
so long as
Today the world is paying much more attention to,obviously, China says and does.
#33337
A
that
B
which
C
what
D
how
The problem of the present world is that those who are imaginative have little experience_________those who are experienced have weak imagination.
#31024
A
unless
B
although
C
because
D
while