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1. This report was written by Tom yesterday. 

2. A lot of flowers are planted in Da lat.

3. A class discussion is held by our teacher every month. 

4. My sister is taught English by Miss Hoa.

5. Milk is used for making butter and cheese. 

6. Tom has been given a present. 

7. Are they often taken to the cinema by Mr. Green on Sundays?

8. Is a meeting held every month? 

9. All the leaves have been turned yellow by the weather. 

10. You have been asked several questions by them, haven't you? 

11. John's parents used to be visited by him at weekends. 

12. Milk is used for making butter and cheese.

13. The lessons are being written by the students now. 

14. She was taught how to apply this theory by her teacher.