求救各位英语大神！
\u6c42\u52a9\u5404\u4f4d\u82f1\u8bed\u5927\u795e21. before
22. yourself
23. price
24. dirty
25. agree
26. A
27. B
Several days ago, I watched an impressing video, which I would like to share with everyone today. Every people have a fear for growing up, when we leave our parent's wing and go on pursuing further education alone. There must be fear in the heart, it is inevitable. As long as we steady our heart, and keep going on, we will succeed.
71 ever 表示在现在以前的任何时候，也就是在过去所有时间里的任何一个时候而once只是指过去时间里的具体某一次
72 accurate 是数据精确，材料准确的意思，一般都是通过测量或实验手段得出来的结果。
而certain 只能是说某人很确定某件事 如，It is certain that she is the best in the class。这就是说话者很确定的意思。它不能表示数据或材料的准确性。
The largest brain ever examined belonged to a person of weak mind
原句的意思是：有史以来检测出最发达的大脑来自一个脑力荏弱的人。
从语法角度讲，ever和once都对
但是，检测或检测过的大脑肯定很多，而once 用上的话则是一旦，一....就的意思，不合理。
Mental tests which are reasonably accurate show no differences in intelligence between races.
相当准确的心理测试显示，竞赛时智力没有差异。
reasonably 是副词，可见后需要跟形容词，而certain 做形容词时 某一；必然的；确信；无疑的；没有精确，准确的意思，无法表达心理测试的准确性。
71、这句话意思是有史以来最大的大脑，ever就有有史以来的意思，once是曾经
曾经发现过的最大的大脑意思不太通，对吧
74、accurate是形容数字、数据之类的东西准确，
certain意思相近，但不用来形容数据，而是我确定、当然了的意思。
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绛旓細11.was punished for 12.surprise surprised surprising 13.was laughed at 14.to thank 15.It's a pity missed 16.too much is bad for
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