Ex 3. Choose the best one (A, B, C or D) to complete the sentence or replace the underlined word. 1. At this time next week we to work to support the air pollution cutting down campaign. A. are cycling B. will be cycling C. will cycle D. will be cycled 2. Someone’s carbon is a measurement of the amount of carbon dioxidethat their activities produce. A. footprint B. energy C. effect D. amount 3. Remember to the lights before going to bed. A. turn on B. stop C.turn D. turn off 4. We will cut down in the use of natural gas because it is and harmful to the environment. A. available B. abundant C. plenty D. limited 5. Hydro power is because dams cannot be built in certain areas. A. abundant B. enough C.limited D.unlimited 6. source of energy is the source that can’t be replaced after use. A. Effective B. Non-renewable C. Renewable D. Natural 7. Which of the following is NOT renewable source of energy? A. wind B. coal C. hydro D. solar 8. We are looking for cheap, clean and sources of energy. A. serious B. dangerous C. effective D. efficient 9. By the middle of the 21st century, people in developing countries more renewable energy. A. used B. have used C. uses D. will be using 10. If we go on electricity, we will have to pay a lot next month. A. turning on B. widened C. wasting D. increasing 11. Biogas is and cheap for cooking and heating. A. serious B. expensive C. plenty D. abundant 12. We should put on our roof for the heating and hot water. A. equipment B. cracks C. solar energy D. solar panels 13. In many countries, people think that electricity, gas and water are not luxuries but . A. necessities B. appliances C. sales D. consumers 14. We should use light bulbs in our homes. A. a bit energy B. efficient C.lowenergy D. little energy 15. A hydropower station in the North of the country next year. A. will be built B. has been built C. was built D. were built Ex 4. Read the passage, and choose the correct answer A, B, C or D for each question. Almost all our energy comes from oil, coal, and natural gas. We call them fossil fuels. The earth’s fossil fuels are running out. What will happen when there is no oil, coal and gas on the earth? Scientists are trying to find and use other alternative sources of energy. We can use energy from the sun, the wind, and the water. Solar energy is unlimited. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintain the temperate of the planet. All are necessary for human life. If we are able to collect solar energy, we will be sure to have this abundant source od power. 1. From which do plants on the earth get energy? A. stars B. the Mars C. the moon D. the sun 2. What are the other words or phrase for fossil fuels? A. natural gas B. oil C. coal D. oil, gas, natural gas 3. Natural sources of energy are energy from . A. wind B. the sun C. water D. the sun, wind, water 4. The word “abundant” in the passage is closet in meaning with . A. plentiful B. limited C. natural D. necessary 5. We are asking the question, “What will happen when there is no oil, coal, and gas on the earth?” because . A. we are now depending so much on oil, coal, and natural gas B. other sources of energy can come from the sun, wind, and water C. we are looking forward to seeing great changes D. we are looking for other alternative sources of energy