根据下面短文内容，用括号内所给单词的正确形式填空，使短文完整、通顺。

Beep! Beep! Beep! The barcode（条形码）technology makes it faster and easier to buy things in stores. You have probably seen the black-and-white barcode on ___（1）___ (product) packaging（外包装）. In 2022, the great invention is 51 years old.

In 1971, an IBM engineer named George Laurer ___（2）___ (come) up with a code（代码）that could be printed on food packages. Then, a complete code system（系统）, the barcode was formed later. The system was used by many ___（3）___ (company) from 1973. Before this, shopkeepers had to ___（4）___ (record) prices by hand which took much time and energy.

Actually, a barcode is ___（5）___ (real) a simple idea: show each product’s information in different numbers（just like the ID card number）, then ___（6）___ (include) these numbers into a code and print it for computers to read. Today, barcodes are scanned（扫描）over six billion times every day and used by two ___（7）___ (million) companies.

What information does a barcode carry? Where the product comes from, ___（8）___ (it) price, production date…It can also help stores always ___（9）___ (know) about their products. For example, if there are 10 boxes of milk and a customer buys one, it will be recorded so that the store owner knows there are nine boxes _____（10）_____ (leave) on the shelf. In the 1980s, libraries started to use barcodes to follow their books in this way.