1. Many lakes and rivers have been destroyed by pollution from factories.
2. His exercises haven't been finished by my brother.
3. Oil has been discovered at the North Pole.
4. Another villa has just been bought by Nam's father.
5. The new president will be interviewed on TV.
6. The seminar can't be held in the hall.
7. The bill has to be paid by Tom before the second of the month.
8. It should be sent to us immediately.