短文改错 假如英语课上老师要求同学们交换修改作文，请你修改你同桌写的以下作文。
问题：
短文改错
假如英语课上老师要求同学们交换修改作文，请你修改你同桌写的以下作文。文中有10处错误，要求你在错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号(∧)，并在其下面写上该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：1. 每处错误及其修改均仅限一词。
2. 只允许修改10处，多者(从11处起)不计分。
We are often warned by our teachers not to waste time because losing time will never return.Nobody
in the world knows what time looks like, but we can't see or touch it. Time flies very quick. Some students
say they don't have enough time to review his lessons. In my opinion, the reason why they say so is
because they don't know how to make use of their time. People often regard time to life because life is
short. So we must devote our time and energy our studies. Laziness is the thief of times, for it not only
brings us a failure, but also do harm to us. We should never put off what should be done today till
tomorrow.
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