Without even thinking about it, we click the remote to turn our TVs ____. Then we turn over to find a channel to watch and sit ____ to enjoy full colour entertainment, news and sport. The basis for modern telecommunications was created in the nineteenth century. The telegraph, which was invented in 1837, meant that messages could be sent ____ the world. The telephone followed in 1876. For the first time, people's voices could be sent ____ long distances, however, wires were needed to connect people who wanted to communicate. It was only with the invention of the radio in 1901 that suddenly people were capable of sending messages ____ the air. The first radio shows were almost twenty years ____.

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