Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 8)

Burning coal is an ……………………………way of heating a house. Gasis much cheaper

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Burning coal is an ……………way of heating a house. Gasis much cheaper (economy)

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Giải thích

Burning coal is an uneconomical way of heating a house. Gasis much cheaper