Hoàn thành câu với từ trong khung) solar panels electricity coal environmental friendly shortage abundant solar energy alternative 1.____________ comes from the heat of the sun. 2. ___________will be placed outdoors to catch the sun’s energy. 3. Burning more ______¬¬¬¬¬¬¬¬¬____, we will pollute our environment. 4. If we continue to burn fossil fuels, we will face a serious __________ of energy 5. Solar energy can be a clean and ___________ energy source in Viet Nam. 6. Wind power is the most promising ___________ source of energy. 7. Although coal causes pollution, it still plays an important role in the production of____________ around the world. 8. Wind energy is widely available and it isn’t harmful to the environment. It is_________