BURNING COAL IS AN ( ECONOMY) WAY OF HEATING A HOUSE. GAS IS MUCH...

Lớp 8 Tiếng Anh Đề thi Olympic Hà Nội - Amsterdam 2011 môn Tiếng Anh lớp 8 - Trường THPT chuyên Hà Nội - Amsterdam

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4. Burning coal is an ( economy) way of heating a house. Gas is much cheaper.