Câu hỏi:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 6 to 10.

We need energy to live and work. Our major source of (6)_______ is oil. Oil is one kind of fossil fuel. The amount of fossil fuels in the world is (7)_______ . Therefore, we must save it and must find new sources of energy. Geothermal (8)_______ and nuclear power are alternative sources of energy. They can give us electricity. Other alternative sources are the sun, waves (9)_______ water. These sources are not only unlimited and available (10)_______ clean and safe for the environment. People should develop and use them more and more in the future.

We need energy to live and work. Our major source of (6)_______ is oil.