7. Закончите предложения, выбрав соответствующий вариант окончания:
1. The wastes of cars and plants pollute the atmosphere b) and destroy the ozone layer and forests which are dying from acid rains.
2. People are concerned about the air and the water used by everyone because they understand that their activities … a) improve and make their life healthier.
3. People must learn to use the environment carefully and c) protect ot from damages caused by their activities.