The traffic light signal was invented by a railway signaling engineer. It was installed (26)_________The House of Parliament in 1868. It (27)_________like any railway signal of the time, and was operated by gas. (28)_________, it exploded and killed a policeman, and the accident (29)_________further development until cars became common. (30)_________traffic lights are an American invention. Red-green (31)_________were installed in Cleveland in 1914. Three-color signals, (32)_________by hand from a tower in the (33)_________of the street, were installed in New York in 1918. The (34)________lights of this type to (35)________in Britain were in London, on the junction between St James’s street and Piccadilly in 1925. 26. A. outside B. out C. out of D. outdoors 27. A. resembled B. looked C. showed D. seemed 28. A. However B. Therefore C. Although D. Despite 29. A. forbade B. avoided C. discouraged D. disappointed 30. A. New B. Recent C. Modern D. Late 31. A. methods B. systems C. means D. ways 32. A. worked B. operated C. turned D. held 33. A. heart B. focus C. halfway D. middle 34. A. original B. primary C. first D. early 35. A. show B. appear C. happen D. become