7. If they had a map they wouldn't get lost.

8. Many houses were destroyed in this village by the storm last week.

9. Was food given to homeless people last year?

11. Many houses were destroyed in this village by the storm last week.

19. Christmas songs are performed fro people in town.

20. Nien asked hoa if she had many friends.

21. Do you mind if I turn on the lights?

22. Soccer is played in the world by many people.

23. I have learnt english for ten years.

24. Would you mind if I played soccer here?

25. I have learnt english since I was ten years old.

26. My book hasn't been returned by mary yet.

27. It's difficult to find a job at my age.

28. It's easy to get acquainted with the regulation in a new school.

29. This letter isn't written by the principal.

30. It's harmful to smoke a lot.

31. A birthday cake is being made in the kitchen by mary.