1. Choose
the sentences that have Passive voice.
1. The storm
destroyed the green-house.
2. The
green-house was destroyed by the storm.
3. Bananas
are grown in Africa.
4. America
was discovered by Columbus.
5. English
is spoken by 350 million people in the world.
6. Rare
animals are kept and protected in the zoos.
7. People
can clean the smoke from factories and power stations.
8. Many
famous beautiful buildings are ruined by acid rains.
2. Change
the Active voice into Passive in the following sentences:
1. Rivers and lakes are poisoned by acid rain and acid snow.
2. Acid rain is produced by many countries.
3. The smoke from factories and power stations can be cleaned by people, but it
is too expensive.