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
2. Acid rain is produced by many countries.
3. The smoke from factories and power stations can be cleaned by people, but it is too expensive.
4. The conferees forest in some parts of the mountains has been destroyed by the fire this year.
5. The Soviet system of training specialists has been inherited by Kazakhstan.
6. A great contribution in development of Kazakhstan as an independent country has been made by scientists.
7. Rare animals and plants previously unknown to the people have been recently discovered and described.