．The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
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what
B
which
C
that
D
though
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Believe it or not, I’m sure that is _____ people call the six sense．
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A
when
B
what
C
which
D
why
The girl _____ leg was broken in the earthquake was taken to the hospital.
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who
B
that
C
which
D
whose
you know your potential, you have to rely on many other people to get to where you are.
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Since
B
If
C
While
D
Once
The American economy is still in trouble，________ the Chinese economy is beginning to pick up.
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when
B
however
C
while
D
therefore
Sometimes,________ we show our gratitude for a person is reflected in the kind of food we serve him or her.
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when
B
whether
C
why
D
how