Read and fill in the blanks with the best answer We need energy to live and work. Our major source of

Câu hỏi :

Read and fill in the blanks with the best answer

We need energy to live and work. Our major source of (19) _________ is oil. Oil is one kind of fossil fuel. The amount of fossil fuels in the world is (20) _________. Therefore, we must save it, and at the same time, we must find new sources of energy. Geothermal heat and nuclear power are alternative (21) _________ of energy. They can give us electricity. Other alternative sources (22) _________ the sun, waves and water. These sources are not only unlimited and available (23)_________ clean and safe for the environment. People should develop and use them more and more in the future.

 

Our major source of (19) _________ is oil. Oil is one kind of fossil fuel.