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The American economy is still in trouble，________ the Chinese economy is beginning to pick up.
#32644
A
when
B
however
C
while
D
therefore
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To enjoy the scenery, Sara would spend long hours on the train ______ travel by air.
#33839
A
as to
B
other than
C
instead of
D
rather than
 He jumped out of bed and ran to the door to see ________ the parcel was for.
#30070
A
who
B
why
C
where
D
what
    volleyball is her main focus, she’s also great at basketball.
#30649
A
Since
B
Once
C
While
D
Unless
The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
#32888
A
if
B
till
C
as
D
while
 ______  it is getting dark.，we’d better hurry
#30121
A
And
B
But
C
Since
D
Unless