They started a campaign to ______ smoking among teenagers.

We need energy to live and work. Our major source of (17) _________is oil. Oil is one kind of fossil fuel. The amount of fossil fuels in the world is (18) _________. Therefore, we must save it, and at the same time, we must find new sources of energy. Geothermal heat and nuclear power are alternative (19) _________of energy. They can give us electricity. Other alternative sources (20) _________ the sun, waves and water. These sources are not only unlimited and available (21)_________clean and safe for the environment. People should develop and use them more and more in the future.

Which of the following is NOT true?

How often do The Olympics Games take place?

When did the 14th Olympic Games take place?

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Mark the letter a, b, c, or d on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

In order to show that learning to write requires effort, the author gives the example of ______.

Tom had been driving all day. He was tired and wanted to stop.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

Normal human beings ______.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

These sources are not only unlimited and available (21)_________clean and safe for the environment.