If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.
A.chances | B.opportunities |
C.questions | D.problems |
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If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.
A.chances | B.opportunities |
C.questions | D.problems |