2 Circle the correct form.

Решение:

• 1. A lot of rivers are polluted by acid rain.
• 2. Pollution is gathered in clouds.
• 3. This factory pollutes the atmosphere.
• 4. Acid rain is caused by toxic fumes that factories emit.
• 5. Rubbish can be recycled.
• 6. Volunteers collect rubbish in the parks.
• 7. Nesting boxes have been built by volunteers.
• 8. Many species have been endangered by pollution recently.