47. Mr. Han is going to visit Hanoi on his work next week.

Hanoi is going to be visited on Mr. Han’s work next week.

48. This company will organize an art exhibition next month.

an art exhibition will be organized next month.

49. Nguyen Hue School will hold the English-speaking contest on next Friday.

the English-speaking contest will be held on next Friday.

50. Tom will return those books back to the library tomorrow.

those books will be returned back to the library tomorrow.
 

51. The postman will deliver newspaper to him next week.

Newspaper will be delivered to him next week by the postman

52. They can’t make tea in cold water. They have to make tea in hold water.

Tea can't be made in cold water. Tea have to be made in hot water

53. A sudden increase in water pressure may break the dam.

The dam may be broken by a sudden increase in water pressure

54. You must clean the floor before you paint it.

The floor must be cleaned before painted

55. The girl has to decide to study law or pharmacy.

To study law or pharmacy have to be decided by the girl