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