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 Wind power is an ancient source of energy ____we may return in the near future.
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A
on which
B
by which
C
to which
D
from which
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Jane is one of the students in the class ______ have ever been to China.
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—Do you like your maths teacher? —Sure, because he is the teacher ___ helps me a lot.
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 Is there a shop around _____ we can buy some toilet articles?
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The visitors saw rows of houses the roofs _______are red.
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