Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
#79977
A
why
B
how
C
unless
D
where
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The news shocked the whole nation ____a strong earthquake hit Yushu on Apr．14, 2010．
#34027
A
what
B
when
C
that
D
which
---- Oh, it’s raining hard outside. Do you think the milkman will arrive?---- Of course. He will come on time ________ it rains.
#30996
A
in case
B
as long as
C
ever since
D
even though
—Oh, I failed again—Don’t lose heart. One more effort, ________ you will succeed.
#80290
A
so that
B
therefore
C
however
D
and
As Benjamin Franklin put it, “A house is not a home it contains food and fire for the mind as well as the body. ”
#30149
A
since
B
as
C
once
D
unless
_________ he took plane, he was frightened to cry.
#31031
A
First time
B
At the first time
C
For the first
D
The first time