Нужен небольшой топик на на тему загрязнения воздуха (air pollution) . где-нибудь 10-15 предложений.

Air pollution  more and more often people are told not to be in direct sunlight, because ultraviolet radiation from the sun can cause skin cancer. normally the ozone layer in the atmosphere protects us from such radiation, but if there are holes in the ozone layer ultra¬violet radiation can get to the earth. many scientists think that these holes are the result of air pollution.  nuclear power stations can go wrong and cause nuclear pollution. this happened in windscale in britain, in three mile island in the usa and chernobyl in the former soviet union. nuclear pollution cannot be seen but its effects can be terrible.  to make air clean again we need good filters at nuclear power stations, at factories and plants and also in cars and buses.  both clean air and clean water are necessary for our health. if people want to survive they must solve these problems quickly. man is beginning to understand that his environment is not just his own town or country, but the whole earth. that's why people all over the world think and speak so much about ecology. 

1looking through the old newspapers he found an interesting article about customs and traditions of old england. 2not knowing what to answer she blushed. 3being a shoolboy he used to play football. 4having read the book he retured it to the library. 5having listened to his explanations we understood that he was right. 6having lived in this city for 20 years he knew each street here. 7being in london we visited the british museum. 8saying good-bye to his friends he left for the airport. 9coming home she found the telegram 10they couldn't get into the house because they had left the keys at work.

  1.  for several centuries after european explorers first sailed to north america, the flags of spain, holland, france, england and sweden flew over different parts of the continen 2.  the flag of the united states of america has 13 stripes-7 red and 6 white-and 50 white stars on a blue field ? 3. as a living symbol of america it stands for the past, present and future of this country. it symbolizes american people, american land and american way of life ? 4. he stripes remind us of the 13 original colonies gained and united by americans?   5. the flag of today evolved out of many earlier flags raised in days gone by ? вроде как всё