Преобразуйте предложения, изменив форму глаголов-сказуемых из действительного залога в страдательный: 1. Specialists have just installed purifying systems for treatment of industrial waters.
2. Recently workers have taken necessary measures to protect rivers and seas from oil waters.
3. Acid rains threaten many forests.
4. In some parts of the world people are developing wildlife reservation models of undisturbed nature now.
5. The solution of the environmental problems requires the cooperation of all nations.

1.For treatment of industrial waters purifying systems have just been installed by specialists.

2.To protect rivers and seas from oil waters necessary measures have recently been taken by workers.

3.Many forrests were threatened by acid rains.

4.Wildlife reservation models of undisturbed nature are being developed in some parts of the world by people now.

5.The cooperation of all nations is required for the solution of the invironmental problems.

Объяснение:

Не могу сказать абсолютно точно, но считаю верным именно такой порядок слов в предложениях. Впрочем, некоторые сомнения возникают только в отношении 1ого и 4ого предложений.