Art Fry was a researcher in the 3M Company. He was bothered by a small irritation every Sunday as he sang in the church choir. That is, after he __77__ his pages in the hymn book with small bits of paper, the small pieces would invariably fall out all over the floor. One day, an idea __78__ Art Fry. He remembered a kind of glue developed by a colleague that everyone thought __79__ a failure because it did not stick very well. He then coated the glue on a paper sample and found that it was not only a good bookmark, but it was great for writing notes. It would stay in place __80__ you wanted it to. Then you could remove it __81__ damage. The resulting product was called the Post-it, one of 3M’s most successful office products. 【題組】79.
(A) is
(B) was
(C) will be
(D) has been
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