Read the text and decide which answer A, B, or C best fits each space. (Đọc văn bản và quyết định câu trả lời A, B hoặc C phù hợp nhất với mỗi chỗ trống.)

Most of our energy comes from fossil fuels (1) coal, oil, and natural gas. Although the supplies of these energy sources are plentiful, they are limited. The (2) of coal and oil is also having very harmful impacts (3) the environment. However, fossil fuels are not the only source of energy and burning fuel is not the only way to (4) heat and motion. Renewable energy offers us a better way. Some energy sources are renewable because they are naturally available (5) last forever. Some sources have enormous supply so human can never use them up. Moreover, renewable energy sources (6) much smaller impacts on the environment than fossil and nuclear fuels. (7) include solar energy, which comes from the sun and can be converted into electricity and heat. Wind, geothermal energy from inside the earth, biomass from plants, and hydropower from water are (8) renewable sources of energy.