题目内容：

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。

文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

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（从第11处起）不计分。

Recently I have started a new job in a small office, which four of us share a water filter(净水器). One of my coworker complained the water tasted "dirty", and she is astonished I could drink the water with any trouble. I even started to doubt my taste buds, but the water really tastes fine. Finally, she figured out the problem was actually my cup, which she simply forgot to clean.

I can't help but to think about the world we live. Too often we quickly blame other people, other things, something else but ourselves. The world isn't perfect, I know, but I think we should take the step back sometimes and ask ourselves some tough questions. Can I be better? Is my heart really pure? …

Please clean your cup. Because when you do, the water will taste much good. I promise you this.