Change into passive:
1. You should keep the flowers in a warm sunny place.
- The flowers............
2. They have built this school for ten years.
- This school...........
3. She is doing English exercise with her friends.
- English exercise............
4. I was making a cake for my father's birthday.
- A cake..................
5. Lan and Nga will buy a new bike.
- A new bike............
6. They are going to plant those trees in the school yard.
- Those trees...............
6. People haven't cleaned the floor.
- The floor.......................
7. Nobody has presented the topic.
- The topic...................
8. People expect that the report will suggest some major reforms.
- It is expected.....................
9. They say that he invented the digital camera.
- It is said.....................
10. Scientists have discovered that there is water on Mars.
- It has been......................