1. What are advantages of renewable energy sources? A. They can't be used up. B. They are easy to be exhausted. C. They create a big carbon footprint. 2. What are disadvantages of non-renewable energy sources? A. They are easy to renew. B. When they are used up, they can't be replaced by nature. C. They take a long time to research. 3. What types of energy does Vietnam use most? A. In Vietnam, people use electricity more efficiently. B. Local people in Bac Giang use biogas for cooking and heating. C. In Vietnam, people mostly use hydro energy and fossil fuels. 4. What can we do to save energy? A. We can save energy by using as much electricity as possible. B. We can save energy by using less water and electricity. C. We can save energy by spending a lot of money on heating and travelling.