TASK 2. 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

We need energy to live and work. Our major source of (1) _________is oil. Oil is one kind of fossil fuel. The amount of fossil fuels in the world is (2) _________. Therefore, we must save it, and at the same time, we must find new sources of energy. Geothermal heat and nuclear power are alternative (3) _________of energy. They can give us electricity. Other alternative sources (4) _________ the sun, waves and water. These sources are not only unlimited and available (5)_________clean and safe for the environment. People should develop and use them more and more in the future.

Our major source of (1) _________is oil. Oil is one kind of fossil fuel.