Прочитайте текст и заполните пропуски подходящими по смыслу словами. In just a few years mobile 1___...: ответ на тест 857129 - Английский язык

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In just a few years mobile 1_______ have become a common sight everywhere. Walk past any cafe and you 2_______ people chatting on their phones or sending text messages. However, some people are concerned that the signals these phones send out may be bad for our health. They worry that holding a mobile close to 3_______ head might have an effect on your brain. So, it may be a good idea 4_______ your ordinary phone when you can.

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Have you got a mobile phone?
Before mobile phones were developed, you could only call someone with a phone which was connected to a phone line. That problem meant that it was often difficult to contact people, particularly if you were on a bus or in a car.
Before mobile phones, people didn’t send text messages to each other. Since they were introduced, text messages have changed the way we communicate. With text messages, you don’t need to actually call someone. You simply type a short message and send it, being careful, of course, to send it to another mobile and not to a home phone.
Mobile phones used to be big and heavy. Now, they’re small and light. The chances are that they will become even smaller and lighter in the future.
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Before mobile phones, people didn’t send text messages to …

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One of 1_______ types of radio programme is radio drama. Although some radio stations only broadcast music, 2_______ also produce plays for their listeners. Many people prefer listening to a play on the radio to watching it on TV because they can be more creative. On TV, the programme-makers 3_______ exactly what a place or a person looks like. On radio, though, you 4_______ imagine it any way you like.

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Before the invention of radio, it was almost 1_______ to communicate over large 2_______. The only way to communicate with people far away was 3_______ a message or a letter with a person. People lit fires on hills as a signal to 4_______, but it wasn’t a very good way of communicating. It was very difficult to find out what was happening in distant places and news often took weeks or even months to travel around the world.

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The invention that swept the world and changed leisure habits for countless millions 1_______ by Scottish-born electrical engineer John Logie Baird. It was television.
It had been realized for some time that 2_______ could be converted into 3_______ impulses, making it possible to transmit such 4_______ over a distance and then reconvert them into light.

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The name electricity came from the Greek word for amber and 1_______ by Elizabeth I’s physician William Gilbert who was among those 2_______ noticed that amber had the power to attract light objects after being rubbed. In the 3_______ century such great names as Michael Faraday, Humphry Davy, Alessandro Volta and Andre Marie Ampere all did 4_______ work on electricity.