Ответ:
1. Old people have been asked to stay in because of the smog.
2. The turtle eggs are checked on (by volunteers) every day.
3. 50 % of the country's electricity will be produced bt solar power.
4. This new method can be used to clean water.
5. The disease is being spread by infected birds.
6. We were being asked to volunteer.
7. The birds must not be fed (by visitors).
8. The flooded houses were emptied with pumps.