短文填空。 Wood-block printing was invented sometime between the 4th and the 7th (1) c______ in China. The earliest book that we have was (2) p______ in 868 and was found in a Dunhuang cave. Wood-block printing took a long time because a new block was needed for every (3) p______ in z book. By the 1 Ith century printed books could be (4) f______ all over China. They included books of Confucius' thoughts, dictionaries, and books on maths. In 1340, books could be printed u-sing two (5) c______, black and red. (6) A______ the Chinese learnt about printing so early, printing was not introduced in other parts of the world for hundreds of years. It is thought that when the great Italian traveler Marco Polo visited China in the 13th century, he (7) s______ printed books. It is possible that Marco Po-lo brought that (8) k______ to Europe. But printed books did not come to Europe (9) u______ 1450 when a German called Johann Gutenberg (10) i______ a printing machine. Twenty-four years later, in 1474, an Englishman called William Caxton printed the first printed book in English. His second book was about the game of chess. Caxton printed about a hundred books, and some can still be found today in museums.