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I. CHOOSE THE WORD IN EACH GROUP THAT HAS THE UNDE...
I. CHOOSE THE WORD IN EACH GROUP THAT HAS THE UNDERLINED PART PRONOUNC...
TRAC NGHIEM LOP 9 10 UNITS
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4. If we don’t find __________ sources of power, we will use up all the fossil fuels in the near future.A. effective B. efficient C. natural D. alternative
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TRAC NGHIEM LOP 9 10 UNITS