The first radio signals were sent twenty years after ____. The first person ____ such signals was the Italian Guglielmo Marconi. His radio transmissions were only sent about one mile, but Marconi ____ that the technology had great potential. He approached the Italian government with his invention. However, the Italian government turned it down, ____ Marconi moved to England to continue his experiments. In 1899 he opened his first radio factory, and ____ two years, he had established a radio link between Britain and the USA. However, Marconi's "wireless telegraph" only ____ signals in the form of Morse code or "dots and dashes". These transmissions were useful for communication between ships, but were ____ the radio broadcasts we hear today. Voices were not heard over the radio ____ 1921

TOEFL practice - Language form and meaning 5

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