Question

Use the following verbs to complete the paragraph:
had discovered / had developed/ had created / had design/ had invented / had been



The Telegraph
It is a device that allows the transmission of information by coded electrical signals over a wire laid between stations. At the beginning of 19th century, a group of inventors first in England and then in United Stated created the Telegraph. The name comes from the Greek: Tele=distant and graphein=to write. Some inventors __________________ and used visual telegraphs before the electric telegraph. By 1840, Samuel F.F. Morse _______________ a single circuit telegraph and ________________ a code that assigned a set of dots and dashes to letters of the English alphabet.
The creation of the telegraph was possible thanks to two previous inventions and discoveries. The first telegraphs developed because Alessandro Volta _______________ the voltaic cell that made possible to power electric devices. Some other inventors ____________________ and refined electromagnetism that made possible to design practical devices such as the electric telegraph.
In 1844, Morse sent his first telegraph message from Washington, D.C., to Baltimore. By 1866, a telegraph line _____________ laid across the Atlantic Ocean to communicate United States and Europe. The telegraph era lasted for more than 100 years.

Answer 1

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