题目内容：

短文改错

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：在错的词下画一横线，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。

Patience is greatly important in our daily life. Once, I waited for a bus come at a stop.30 minutes passed, but no bus came. Both upset and annoying , I decided to walk by foot. But no sooner had I left when the bus arrived. I thought if I had waited for one more minutes , I would have caught it. If I chose to take a next bus，I would have to wait for another 30 minutes. Only then do I realize my problem. Being impatient will possible waste all the effort that we have put  it in. Now, whenever I am close to losing my impatience, I will think of this experience.