Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (đề 23)

In the case of coal fired electricity, each kilowatt you save

28/40

In the case of coal fired electricity, each kilowatt you save not only puts (28) ______ back into your pockets, but also avoids up to 1.5 pounds of carbon dioxide emission being generated.

product

economy

debt

cash