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e came back. I was just going to give up when I noticed that one bedroom window was slightly open. I found a barrel and pushed it under the window. As the barrel was very heavy, I made a lot of noise. But in the end, I managed to climb up and open the window. I actually had one leg inside the bedroom when I suddenly realized that someone was shining a torch up at me. I looked down and saw a policeman and an old lady, one of Verno39。s neighbours. “What are you doing up there? said the policeman. Feeling like a plete fool, I replied, “I was just going to feed Mr. Davis39。s birds. Questions 15 to 17 are based on the passage you have just heard. 15. Why couldn39。t the man open the door? 16. Why did the man feel desperate? 17. Why did the man feel like a fool? Passage Three When Iragi troops blew up hundreds of Kuwaiti oil well at the end of Gulf War, scientists feared environmental disaster. Would black powder in the smoke from the fires circles the globe and block out the sun? Many said “No way” rain would wash the black powder from the atmosphere. But in America, air sampling balloons have detected high concentrations of particles similar to those collected in Kuwait. Now that the fires are out scientists are turning their attention to yet another threat:the oil that didn39。t catch fire. It has formed huge lakes in the Kuwaiti desert. They trap insects and birds, and poison a variety of other desert animals and plants. The only good news is that the oil lakes have not affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface. Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents. Officials are trying to anize a quick cleanup, but they are not sure how to do it. One possibility is to burn the oil. Get those blackpowder detectors ready. Questions 18 to 20 are based on the passage you have just heard. 18. What were the scientists worried about soon after the Gulf War? 19. What was the good news for scientists? 20. What are the officials trying to do at the moment?