20. Ten thousand dong for breakfast is usually given to her by her parents every morning.

21. A lot of trees are grown every year by them.

22. Many parties are held in this hall every month.

23. English is learned everywhere in the world by people.

24. Their favorite English songs are sometimes sung at recess by many teenagers.

25. Vietnamese is taught to minority ethnic children by her.

26. Food is sometimes stolen from tourists by monkeys.

27. The candles are lit in the evening at the Earth Hour by them.

28. Uniforms are worn by students when they go to school.

29. Her essays are often written with a pencil by her.

30. Hundreds of cars are sold every day.

31. Some money is often given to me by my parents when I get good marks.

32. Is she shown the way to the post office by them?

33. Difficult songs to sing are never chosen by the competitors.