$\frac{2}{3}-\frac{1}{4}-\frac{1}{6}$ =____

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。

    I was reading an article in a book while I came across a word I didn't know. “Dad, what is the meaning of the word?” My dad, as he usual did after work, was watching his most favorite show. “You have the dictionary, don't you?” he shot back. He didn't even look up my face. I went back my room, and there on my study table is that dictionary. I looked it up and found it's exact meaning. Ten year have passed and I still use that dictionary, along with the lesson I received earlier in life from my old man: to be independent.