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The poisoning of the world's land, air, and water is the fastest-spreading disease of civilisation. it probably produces fewer headlines than wars, earthquakes and floods, but it is potentially one of history's greatest dangers to human life on earth. if present trends continue for the next several decades, our planet will become uninhabitable.overpopulation, pollution and energy consumption have created such planet-wide problems as massive deforestation, ozone depletion, acid rains and the global warming that is believed to be coused by the greenhouse effect.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.

1. Have you seen him since he left Leningrad? 2. He has already returned? - Yes, he returned three days ago. 3. I have never seen this man. 4. How many English books you read lately? 5. He just left. 6. I lost the key to the apartment, and now I can not get there. 7. They do not clean the room for a week. 8. I bought an interesting book. Want to read it? 9. Someone broke a window in the room and now ho-lodno. 10. I forgot his phone and now I can not call. 11. I left my watch at home and I can not tell you to-ELSE hour. 12. Son of my sister's only four years old, but he has learned to read. 13.I never even sly-shala. 14. You have now moved to a new apartment? 15. You made a lot of mistakes in the dictation. 16. This month, I read three English books. 17. My friend went to Brighton a week ago and still has not. 18. I have not seen him lately. 19. Where did you put my hat? I have been unable to find it. 20. All came from, you can start a collection. 21. I've come to talk with you. 22. You understand the rules? 23. Did you read today in the newspaper article about our institute?