Fill in the blanks with the words or phrases given in the box. A. automatic B. collided C. injured D. collapsed E. signal F. crushed A fatal accident occurred in Washington D.C. on June 22, 2009, on its extensive subway, the second busiest and one of the newest in the U.S. A train into the rear of another which had stopped at an above-ground station. The front car of the moving train . Nine people in that car were killed, and 52 in both trains were .The immediate cause of the accident was the failure of the train control system to detect the stationary train and send a for the moving train to stop. People were killed because the front of one of the cars was due to structural design flaws. A. B. C. D. E. F.