44. Mr. Han is going to visit Hanoi on his work next week. 45. This company will organize an art exhibition next month. 46. Nguyen Hue School will hold the English-speaking contest on next Friday. 47. Tom will return those books back to the library tomorrow. 48. The postman will deliver newspaper to him next week. 49. They can't make tea in cold water. They have to make tea in hold water. 50. A sudden increase in water pressure may break the dam. 51. You must clean the floor before you paint it. 52. The girl has to decide to study law or pharmacy. 31