sửa lỗi giúp mình luôn ạ 70. The formula (A) used in the study calls (B) for either peroxide or mentaldehyde, (C) but metaldenhyde (D) was not always available. 71. (A) To determine an object’s force, the (B) mass and speed of (C) the object must be (D) measure. 72. The (A) most common time for (B) tornados to occur (C) are in the afternoon or evening on (D) hot, humid spring day. 73. Automakers Nissan and Ford and (A) several aerospace research facilities in Great Britain (B) are working lately to apply (C) active noise cancellation (D) to entire cars and planes. 74. When a (A) country in an early stage of development, (B) investments in (C) fixed capital (D) are vital. Is vital 75. John Chapman became (A) famous in American folklore as ‘Johnny Appleseed’ after he (B) plants trees (C) throughout the north-eastern (D) part of the United States. Had planted 76. (A) In as much he kept (B) mostly (C) to himself, the author of The Treasure of the Sierra Madre (D) was known as “the mysterious B. Treuen.” 77. There (A) is not (B) many information (C) available (D) on that subject. much 78. The waitress (A) will bring you (B) the another bowl (C) of soup (D) if you want. 79. It was difficult (A) to believe that (B) what we read (C) in the newspaper was a (D) truly story. True 80. He (A) went to the lecture (B) for hearing about the (C) latest agricultural (D) techniques.