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It is a story of an inventor whose creativity and persistence (1) (result) in a very useful product.What (2) (be) the famous invention?It is Liquid Paper, the white liquid that (3) (cover) up the mistakes you (4) .. (make) when writ- ing or typing.It (5)... (invent) by Bette Nesmith Graham, a secretary in Dallas, Texas, in the early 1950s At the time, she (6) (be) a twenty-seven-year-old sin- gle mother ofone son, struggling to make ends meet and working as a secretary to the chairman of a big Dallas bank.When she (7).(begin) to work with her first electric typewriter, she (8).. (find) that the type marks she (9) (type) onto the paper (10) .. (not, erase) as cleanly as those from manual typewriters ​

1)result2)is3)cover’s4)made5)is inventing 6)is7)is beginning8)is finding 9)is typing10)don’t erase