The planet Earth is only a tiny part of the universe, but it's the only place where human beings can live.
Today, our planet is in serious danger. Acid rains, global warming, air and water pollution, overpopulation are the problems that threaten human life on Earth.
Who is to blame for the disaster? The answer is simple: all of us.
Our forests are disappearing because they are cut down or burnt. If this trend continues, one day we won't have enough oxygen to breathe.
The seas are in danger. They are filled with poison: industrial and nuclear waste, chemical fertilisers and pesticides. The Mediterranean is already nearly dead; the North Sea is following. The Aral Sea is on the brink of extinction. If nothing is done about it, one day nothing will be able to live in the seas.
Every ten minutes one kind of animal, plant or insect dies out for ever. If nothing is done about it, one million species that are alive today may soon become extinct.
Air pollution is another serious problem. In Cairo just breathing the air is dangerous — equivalent to smoking two packs of cigarettes a day. The same holds true for many Russian cities.
Factories emit tons of harmful chemicals. These emissions have disastrous consequences for our planet. They are the main reason for the greenhouse effect and acid rains.
An even greater threat are nuclear power stations. We all know how tragic the consequences of the Chernobyl disaster are.
Fortunately, it's not too late to solve these problems. We have the time, the money and even the technology to make our planet a better, cleaner and safer place. We can plant trees and create parks for endangered species. We can recycle litter. We can support green parties and put pressure on those in power. Together we can save the planet and all of us with it.
1. The US is situated in the central part of the North American continent.
2. It is washed by the Pacific Ocean, the Atlantic Ocean and the Gulf of Mexico.
3. The weather is very different in the USA. The climate of the country varies greatly from arctic in Alaska, through continental in the central part to subtropical in the south. The coldest weather is in the north of the country (40 degrees below zero) in winter. The south has the subtropical climate with temperature 49 degrees above zero in summer.
4. The US scenery varies across the large country from tropical beaches in Florida to peaks in the Rocky Mountains, from rolling prairie lands and barren deserts in the West to dense wilderness areas in the Northeast and Northwest.
5. The population of the country is more than 325 million people.
6. The Great Lakes, the Grand Canyon, the majestic Yosemite Valley and Yellowstone National Park are the most famous places to enjoy the beauty and power of wild America.
7. The mighty rivers of America are the Mississippi River, the Missouri River and the Colorado River.
8. In the USA here are big mountain chains: the Appalachian Mountains, the Rocky Mountains and the Sierra Nevada.
9. The Grand Canyon attracts people with its immense size and spectacular colours. It is very beautiful with different kinds of plants and animals on opposite sides of the canyon.
10. People say that the US is a young country because it has only been independent for around three hundred years.
11. Americans like to have fun and enjoy their free time. They like going shopping, outdoor activities, going out with friends and watching games on TV or in a stadium. They are interested in sports: football, baseball, basketball, ice hockey, tennis and golf.
12. I think that the U.S. is a "melting pot" because there are so many different social groups from different religious, ethnic, racial and cultural backgrounds. No other place in the world has such a diverse population.
a will have stop studying b will have been sterilizing c will be washing d will have finished e will have been working f will stop smoking g will be learning
h will have learnt/learned i I will take
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