4 Write a word from the box in each gap. battery built calculator cities designed found genius invented towers ● The first mobile phone was (1) invented in 1973 by a man named Martin Cooper, who was a(n) (2) genius. He (3) designed the first mobile phone to look like a phone, but it didn't look like the ones we use today. It was a very large, heavy phone, and the (4) battery only lasted for 20 minutes. However, Cooper said that wasn't a problem because you couldn't hold the phone up for that long. Since then, people have (5) found out ways to make mobile phones very small. (6) Mobile phones can also be used for other things, like planning your day, or as a(n) (7) calculator to do simple maths problems. They are used in both big and small (8) cities. They can be used in the countryside too thanks to tall (9) towers that mobile phone companies have (10) built. Mobile phones have become so important that most of us couldn't live without them.

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