Is there an energy problem? Some people (1)…………. so. Using oil is bad because it makes (2)…………. air. In addition, there might not be much (3)…………. in
Is there an energy problem? Some people (1)…………. so. Using oil is bad because it makes (2)…………. air. In addition, there might not be much (3)…………. in 30 years. One possible answer is energy (4)……………… wind. How does wind power work? Special machines change wind into electricity. They are called wind (5)………….. .These big, heavy … Đọc tiếp