ADMICRO

Circle A, B, C, or D  which best completes each blank in the following passage. 

The traffic light signal was invented by a railway signaling engineer. It was installed (36)_______the House of Parliament in 1868. It (37)_______like any railway signal of the time, and was operated by gas. However, it exploded and killed a policeman, and the accident (38)_______ further development until cars became common.

Modern traffic lights are an American invention. Red-green systems were installed in Cleveland in 1914. Three-color signals, (39)_______by hand from a tower in the middle of the street, were installed in New York in 1918. The first lights of this type to (40)_______in Britain were in London, on the junction between St. James street and Piccadilly in 1925.

36_________

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