下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号（∧），并在下面加上该加的词。
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（从第11处起）不计分。
How an unbelievable scene ! A modern young couple were eating fruit in public and had thrown a plenty of waste on the ground. When an old cleaner comes to clean up, the man was very angry. He pointed at the cleaner, said in a loud voice," How impolite! They haven't finished eating!" " How could people behave such badly?" I thought. Obvious, in their eyes, they could do all they liked and ignore other's feelings. In my opinion, we should pay attention our behavior, obey public rules and respect other's works. We should know that really civilized people are those who have good manners but a beautiful mind all the time.