VII. Dùng đúng dạng của từ trong ngoặc
73. playwright
74. improvement
75. grammatically
76 + 77. competitors - competitive
78. advertisement
79. accidentally
80. thoughtless
81. products
82. tourists
83. persuasively
84. industrious
85. residential
86. mysterious
87. numerous
88. thankful
89. descriptive
90. endangered