10. Nguyen Hue School will hold an English-speaking Contest next month.
=> 10.An English-speaking Contest will be hold by Nguyen Hue School next month.

11. A man requested the stranger to leave the meeting.
=> 11.The stranger was requested to leave the meeting.

12. They have eaten all the dinner since they finished the conversation.
=> 12.All the dinner have been eaten since they finshed the conversation.

20. Why didn't they mend the roof before it fell in?
=> 20.Why wasn't the roof mended before it fell in?

21. we are using too much electricity.
=> 21.We are thought to being used too much electricity.

22. Every year, Viet Nam exports millions of tons of rice.
=> 22.Millions of ton of rice are exported by Viet Nam every year.

23. Vietnamese people celebrate their Lunar New Year Festival around January and Feb 41. S
=> 23. Vietnamese people's Lunar New Year Festival is celebrated around January and February.

24. Our teacher always advises us to study harder on the second term.
=> 24.We are always advised to study harder by our teacher on the second term.

The Library of Congress in the USA employs over 5000 employees.
=> 24.Over 5000 employees are employed by the Library of Congress in the USA.

25. My mother is making “Special Chinese Fried Rice" in the kitchen now.
=> 25. Special Chinese Fried Rice is being made in the kitchen by my mother now.