小测验：选择正确的单词

1. He blush to admit that he have make a ridiculous mistake.
   他惭愧地承认自己犯了个可笑的错误。
2. His mistakes led to his failure.
   他的错误导致了他的失败。
3. I mustered the courage to admit my mistake.
   我鼓起勇气承认错误。
4. His costly mistake resulted in severe loss.
   他的严重的错误导致了重大的损失。
5. It is easy to change a typing mistake.
   要修改打错的字很容易。

　1个名词解释