Đọc đoạn văn sau và trả lời câu hỏi bằng cách chọn đáp án đúng nhất A, B, C hoặc D

With the development of science and technology, more and more energy is used every day. Nowadays many rural areas ___(1)___ Viet Nam have been electrified, and more electricity ___(2)___. If everyone wastes energy, it will quickly run ot. Students at school should learn how to ___(3)___ energy, for example, they should ___(4)___ electric lights when they leave their classrooms. Moreover, we may waste electricity at home if we use a lot of bulbs. By not wasting energy, we will save a lot of natural resources such as coal, gas ___(5)___ oil.