III. Change these sentences to the passive voice :
10. Nguyen Hue School will hold an English-speaking Contest next month.
11. A man requested the stranger to leave the meeting.
12. They have eaten all the dinner since they finished the conversation.
20. Why didn’t they mend the roof before it fell in?
21. People said that the policeman soon died of cancer.
22. People think that we are using too much electricity.
23. Every year, Viet Nam exports millions of tons of rice.
24. Vietnamese people celebrate their Lunar New Year Festival around January and February.
25. Our teacher always advises us to study harder on the second term.
26. The Library of Congress in the USA employs over 5000 employees.
27. My mother is making “Special Chinese Fried Rice” in the kitchen now.