76.Paper making began in China and from here it s__________ to North America and Europe.
75.I __________(吃惊,惊奇) at your ignorance.
74.He was so poor that he had to earn his _________(船费) by doing jobs on the ship.
73.What I know about it is ___________(有限).
72.If you want to learn skating, you must learn to keep __________(平
衡) yourself.
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.