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35. Two letters for Hung's friends are written by him every month.
36. Many noises are being made in the class by students.
37. A birthday party will be made for their son next week.
38. A meal has just been cooked for family by him.
39. Her lessons are being studied now.
40. This test can be done very well.
41. Twenty pictures for all his life have been drawn by Mr.John.
42. A picture is being drawn by Manh and Nam now.
43. His car used to be driven to work by him last year.
44. The dentist will be seen to check my teeth./ I will have my teeth checked by the dentist next week.
45. Her umbrella is taken by her in case it will rain.
46. The flowers are watered by Hai every morning.
47. A small object in the far distance can be seen by her.
48. The papers are being cut into different shapes by Long.
49. The riverbank is covered by weeds.
50. The room was filled with smoke.