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IN 1920 PEOPLE NEVER USED CELLPHONE, IT WAS NOT INVENTED.
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IN 1973 THE FIRST CELLPHONE WAS INVENTED, MOST OF PEOPLE SELDOM USED IT.
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IN 1980, PEOPLE SOMETIMES USED CELLPHONE. MOST OF PEOPLE DIDN'T HAVE ONE.
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IN 1990, EVERYBODY OFTEN USED CELLPHONE AT WORK.
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NOWADAYS PEOPLE ALWAYS USE CELLPHONE, EVERYBODY HAS ONE.