1. We never SMOKE cigarettes at any time. John always SMOKES a pipe but we PREFER cigars. 2. My wife's mother HAS BEEN LIVING with us for the last six months. 3. She IS GOING AWAY today. My wife IS HELPING her with her packing now. 4. The boys HAVE BEEN EATING green apples all day. Now they ARE ill, and their mother IS TALKING to the doctor on the phone. 5. The boys HAVE GONE to bed because they are ill. The doctor HAVE prescribeD some medicine. Their mother IS GIVING them some now. 6. My brother usually VISITS his business friends two or three times a year. He IS TRAVELLING in Germany at present. 7. She HAS READ many books on astronomy and so she really KNOWS the subject. 8.1 HAVE BEEN LISTENING to you for twenty minutes but I HAVEN'T understOOD anything. People usually THINK first and SPEAK afterwards. 9. Peter HAS BEEN DRIVING a car for years but he HAS never driveN at night before. 10. John IS goING out). He HAS just PUT his coat on. 11. Peter HAS BEEN readING in bad light and now he IS havING a headache. 12. Our train usually LEAVES at two o'clock. Father HAS BEEN traveLLING by that train every Friday for five years. 13. Look out of the window.IS IT RAINING? I hope not as I HAVE not BROUGHT a raincoat today.
Polluted their surroundings. But until now pollution was not such a serious problem. In past most people lived in uncrowded rural areas and didn’t have pollution-causing machines. But with the development of crowded industrial cities the problem of pollution has become more important. Using automobiles and other machines made pollution steadily worse. Since the 1950’s people have become alarmed with the danger of environmental pollution.Air, water, and soil are necessary for existence of all living things. But polluted air can cause illness, and even death. Polluted water kills fish and other marine life. On polluted soil, food products can’t be grown. In addition environmental pollution spoils the natural beauty of our planet.Pollution is a very complicated and a serious problem. Automobiles are polluting the air but they provide fast transportation for the people. Plants and factories pollute the air and the water but they provide jobs for people and produce necessary goods. Fertilizers and pesticides are important for growing crops but they pollute soil.Thus, people would have to stop using many useful things if they wanted to end pollution immediately. Most people don’t agree to do that. But pollution can be reduced gradually. Scientists and engineers can find the ways to reduce pollution from automobiles and factories. Government can pass the laws that would make enterprises take measures for reducing of pollution. Individuals and groups of people can work together to persuade enterprises to stop polluting environment.
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