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IT IS DIFFICULT ________ ALL OF US TO STOP A FORES...
IT IS DIFFICULT ________ ALL OF US TO STOP A FOREST FIRE.
300 CAU TRAC NGHIEM HOC KY II KHOI 10
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136. It is difficult ________ all of us to stop a forest fire.
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136.
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300 CAU TRAC NGHIEM HOC KY II KHOI 10