III. Change into passive , using the present simple and past simple tenses:

1. She does the housework this morning. 

- The housework........

2. People use plastic to make toys. 

- Plastic. 

3. My father repaired the house yesterday. 

- The house. 

4. I met him at the post office last week. 

- He ........ 

5. We bought a new book last month. 

- A new book. 

IV. 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..