下面短文中共有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（^），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

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。

Hello, boys and girls! Today, I am going to talk with what you should do when a fire alarm go off. If you hear the alarm, stand in line at the door and wait your teacher to lead you outside. Stay close to your teacher and classmate. Don't panic or get out of line, and trying to remain quiet and calmly. Soon the firefighters will come and put out a fire. If it's a false alarm and there is no fire, your teacher will lead us back to the classroom. If you notice that when someone is missing and hurt, tell your teacher immediately.

王林经营一书店，每月店租金4000元，员工总薪资6000元，其他开支2000元，另装潢费用30万元，按5年摊提折旧，若毛利率(相当于边际贡献率)为20%，不考虑税负与自有资金机会成本，则每月的营业额为( )元时，恰可达到损益平衡。

A．85000

B．87853

C．95560

D．96465