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76.Paper making began in China and from here it s__________ to North America and Europe.

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75.I __________(吃惊,惊奇) at your ignorance.

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74.He was so poor that he had to earn his _________(船费) by doing jobs on the ship.

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73.What I know about it is ___________(有限).                                                                                                                                  

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72.If you want to learn skating, you must learn to keep __________(平

衡) yourself.

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      根据题中所给的汉语或首字母写出符合句意的单词的正确形式。

71.Social__________(风俗) are different in different countries.

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