1. When my mother came home, I was having dinner.2. When Kate returned, I was listening to the radio.3. When mother enter his room, her son was drawing a picture.4. When my sister came in, I was doing my lessons.5. My friend was playing with his cat when I came to see him.6. When we were doing our homework, our sister left home.7. They were disscussing the latest ivents when telephone rang.8. The young people were dancing when Icame to the party.9. When he was washing the dishes, he broke a plate.10. What were they doing when you saw them?
ClimateClimate is the weather in a certain place for a long period of time. The climate has a very important influence on plants, animals and humans and varies in different parts of the world.Russia is the biggest country in the world. It is located on a vast territory from the Pacific coast to the center of Europe, and its climate in the north, south, east and west varies. In the west, for example, the climate is usually mild and wet. At the same time, the coldest place on the planet is in the north of Siberia, whereas in the south of Russia there is a lot of sunlight, and the heat in the summer can be really terrible. Summer and winter options in Moscow, Omsk or Krasnoyarsk, in Volgograd or Rostov. In the Arctic, the temperature in winter is quite low. In the taiga zone, long, harsh winters and short summers. Between the Black and Caspian Seas it is very hot in the summer.But recently the climate in our country has changed very much, especially in its European part. Some scientists believe that the world is getting hotter. If you compare the temperature of Moscow summer and winter at the beginning and at the end, you will find that the temperature has actually changed. Winters became warmer. Sometimes a little snowball falls in January, and there were winters when it was raining on the eve of the New Year (not snow!).Many people say that this is due to the greenhouse effect. Have you ever heard of this? It happens like this: sunlight gives us warmth. Some of the heat warms the atmosphere, some of the heat returns back to space. Nowadays, the air surrounding the earth has become much warmer due to the fact that the heat can not return back to space. That's why the temperatures of winter and summer in many places are higher. Over the past hundred years, people have produced a lot of carbon dioxide. This gas in the atmosphere acts like glass in a greenhouse. He lets in the heat, but does not allow much heat to escape. Sothat the atmosphere is getting warmer. Where does carbon dioxide come from? People and animals inhale oxygen and exhale carbon dioxide. We produce carbon dioxide when we burn things. Trees absorb gas from the air and produce oxygen, but over the past five years, people have cut down and burned a large number of tropical forests. This means that there are few trees and, of course, a lot of carbon dioxide! ,As we can see, the climate in different parts of the world is gradually changing from year to year. These changes can be dangerous for our fragile planet, which needs protection. The Earth is millions of years old, much older than humans. We know a lot of her secrets. But many have yet to learn. Summary
