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    阅读下面短文，在空白处填入适当内容（不多于3个单词）或括号内单词的正确形式。

    Do you know anything about the1.(invent) of the bar code (条形码) ?2.small food store owner found it was difficult to keep records of the product information. In 1948, he asked the Drexel Institute（研究所） of Technology 3.(solve) this problem. Bernard Silver, a graduate student, was 4. ( interest) in this technology. He and his friend Norman Joseph Woodland started to work on it. Soon , they invented 5. (they) first working system(系统).

    The system did work 6.first, but it was very expensive and sometimes the system didn't work well. If it was to become popular in stores, the problems had to be solved.7.(final), Woodland solved them.

    The patent(专利权) for the bar code system was asked for by Silver and Woodland in 1949, but the patent was not given8.1952. Although this patent was9.( give), the system was still not popular among store owners.

    In 1970, a business named Logicon Inc. invented the Universal Grocery Products Identification Code (食品工业统码). Marsh Supermarket in Troy was the first store to set up this bar code reading system. It has become very popular ever since, and now it's used in all10.( type) of stores all over the world.

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