Của bác tus nhá 

Làm xong cái bài này mà bác ko cho tou hay nhất và 5 sao thì tou muốn chết vì hộc máu mất =)

45. B

46. A

47. C

48. B

49. C

50. B

51. will be given

52. have read

53. was elected

54. has not been cleaned

55. had gone

56. were written

57. will be chosen

58. should be

59. should not have gone

60. have walked

61. is

62. much

63. walking/having walked

64. sad

65. there are

66. does

67. rains

68. in

69. is

70. homesickness

71. FREEDOM

72. SLAVERY

73. PROUD

74. NATIONAL

75. CULTURAL

76. PUBLIC

77. DIFICULT

78. SOLVE

79. HAVING

80. SUCCESSFUL

81. as

82. as/because/since

45.b

46.a

47.c

48.c

49.d

50.b

IV:

1. will give 

2.have read 

3.elected

4.hasn't been cleaned

5. had gone 

6. were written

7.will be chosen

8. will be 

9. should't go

10. are walking

V:

1. are- is

2. many - much 

3. walk - walking 

4. sadly - sad 

5. there - there're 

6. doesn't - does 

7. may - bỏ

8. by - on 

9. are - is 

10. shock 

VI:

1.freedom - slavery 

2. pround - national 

3. cultural - publc

4. difficult - solve 

5. having - successful

                                                                    Chúc bạn học giỏi!