In 1910 the world was shocked by a particularly cold-blooded murder. H. H. Crippen was 【21】______ American doctor who worked in London. He was a married 【22】______ ,but when he was 【23】______ in England, he fell in love 【24】______ his secretary. Instead of asking his 【25】______ for a divorce (离) ,he killed her and buried 【26】______ body in the cellar(地下室) of his house. Then he and his secretary, who was dressed 【27】______ a boy, sailed on a 【28】______ called “The Montrose” for New York. Only a very 【29】______ time before, however, the wireless telegraph (无线电报) 【30】______ been invented. The Montrose was one of the 【31】______ ships equipped with Marconi's wireless, and the passengers were not 【32】______ ignorant of its presence on board, but probably did not 【33】______ know what a “wireless telegraph” 【34】______ . The captain of the ship recognized Crippen and secretly 【35】______ a message to the London police. An inspector set out in a faster ship, and 【36】______ up with the Montrose in the Atlantic. 【37】______ up as a sailor, he boarded the Montrose 【38】______ she reached New York, and arrested Dr. Crippen. Eighteen months 【39】______ , the British Government passed a law that all passenger ships 【40】______ carry wireless. 【21】