----- Nội dung dịch tự động từ ảnh ----- 8. It (take)billions of lifetimes for new fossil fuels to form. 9. At the current time, many families, 10. We (look) for ways to use less energy. (discuss) about the advantages of some energy sources now. Exercise 6. Fill in the blanks with the correct form of a suitable verb. show take a lot of money on heating because it was very cold. low energy light bulbs in the classrooms at the moment. put keep install pay use check 1. Last year, we 2. The electrician 3. Our teacher 4. the plumber 5. your father carbon footprint? 6. What will you do 7. We will walk to school 8. My uncle 9. We a video on types of renewable energy sources yesterday. cracks in the pipes in the bathroom now? the electricity bill last week? fit and protect the environment. new glass in the windows to stop heat escaping tomorrow. a test on sources of energy at present. 10. People in developing countries reduce spend energy from the Sun, the wind, and the water these days.