Change the Active voice into Passive in the following sentences: 1. Acid rain and acid snow poison rivers and lakes too. 2. Many countries produce acid rain. 3.People can clean the smoke from factories and power stations, but it is too expensive. 4. The fire has destroyed the conferees forest in some parts of the mountains this year. 5. Kazakhstan has inherited the Soviet system of training specialists. 6. Scientists have made a great contribution in development of Kazakhstan as an independent country 7. They have recently discovered and described rare animals and plants previously unknown to the people