短文改错。
英语课上，老师要求同桌同学相互修改作文。假设以下短文为你同桌所写，请你对其行修改。
短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（/\），并在此符号下面写出该加的词。
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。
Dear Dad,
You are busy every day that you never pay attention to your health. I was worried about your health
all the time. I'd like to give you some advices. I hear that walking is the best sport. Your company isn't
far away from home, is it? Why not to walk to the office? You'd better take exercise at most once a week.
You can play a basketball in the gym. Going to swim is a nice choice, too.Trying not to stay up too lately.
Having enough sleep can help your brain work better. Of course, this is very important to have healthy food.
Dad, please receive my advice. I really wish you healthy!
Your loving daughter,
Mary
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2C(g)达到平衡的标志是（ ）