About 4000 years ago people had to write on ____. And 1000 years ago they had to copy the books they liked. By ____. In 1454 Gutenberg invented a ____ machine and two years later he printed the ____. After that people ____ have to copy books by hand anymore. At the beginning of our millenium the electronic book was intoduced. Now we can read a real ____ book or an ____.

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