Изменить активный голос в пассивный в следующих предложениях: 1. acid rain and acid snow poison rivers and lakes too. 2. many countries produse acid rain. 3. people can clean the smoke from factories and power stations, but it is too expensive.

1.Rivers and lakes are poisoned by acid rain and acid snow.
2.Acid rain is produced by many countries.
3.The smoke from factories and power stations can be cleaned,but it is too expensive.