B. Vocabulary and Grammar: Bài 1. Choose the best option to fill in the blank. Question 1: When you save energy, you not only save money, you also reduce the demand for coal, oil, and natural gas and that is a great way to play a part in saving the planet. D. biogas C. fossil fuels A. carbon footprint B. electricity Question 2: In India, the demand for has always been more than the supply. D. electricity A. shortage B. sources Question 3: collecting sunlight and converting it into electricity. D. Wind A. Hydro electric power sources in Vietnam including sun, wind, water, etc. Question 4: There are many available B. hydro A. nuclear C. renewable D. solar on the lower Mekong. Question 5: Laos and Cambodia have big plans for building up to 11 C. energy A. dams B. slogans D. coals Question 6: A. Turbine Question C. slogan energy is produced by C. Solar B. Nuclear can be an excellent source of free, renewable energy for poor farmers. D. Bulb C. Solar panel B. Biogas 7: The government has warned that Britain will face power D. energy C. slogans B. shortages in the coming winters. such as