根据短文内容及首字母提示补全单词，使短文完整、通顺

    Nowadays, we are in a modern society. Everybody should be p____ in public. But sometimes some people like to c____ in line when they buy tickets or get on the bus or subway. They take other's places as well as time when they are in line, so it is i____. I can't s____ that. Sometimes, I even get mad when I see them cut in line.

    When this h____, I often say, “Would you mind w____ in line? ” But sometimes some of them are angry w____ me and they say, “It's none of your business. ” So I f____ angrier. Then I only tell it to the people who sell the tickets. At last the people who are breaking the r____ of etiquette don't get their tickets. So I am happy and the people who cut in line are u____.

细胞中最重要的结构是（  ）

二次三项式3x²﹣4x+6的值为9，则$x^2-\frac{4}{3}x$+6的值为（　　）