70. forty-five minutes are the maximum length of time allowed for the exam. Are->Is

71. Living expenses in this country, as well as in many others, are at an all-time high. Are->Is

72. The news on the radio and TV stations confirm that a serious storm is approaching our city. (hình như ko sai)

73. Every elementary school teacher have to take this examination. Have->has

74. A pairs of jeans were in the washing machine this morning.

75. Some of the movies about the creatures from outer space was surprisingly funny. Was->Were

76. After she had perused the material, the secretary decided that everything were in order. Were->was

70. are=> is

71. are=> is ( Khi chủ ngữ bắt đầu bằng V-ing hoặc To-inf thì chia động từ số ít)

72. is=> will be (thì tương lai tiếp diễn)

73. teacher=> teachers (every là số nhiều)

74. were=> was (a pair: một đôi)

75. câu này hình như không sai

76. were=> was (Everything là Đại từ bất định, ở dạng số ít)

 ~~ Học tốt ~~