Нужно перевести активный залог в пассивный 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.

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