A motto is a sentence or a phrase which can inspire us especially when we are ____ (face) with difficulties. Many of us use well-know ____ (say) as mottos, such as “Where there is a will, there is a way.” Or “nothing is difficult if you put your heat into it.”, and so on. My motto is “God helps those who help____ Sometimes I am lazy ____ don't want to make efforts to work hard, but the moment I think of my motto I will get____(energy) again and devote myself to what I am doing. I write my motto ____ I can see it easily. Every time I fail in my exam and begin to lose heart, the sight of my motto inspires me ____ much confidence. My motto also makes me become an ____ (dependent) person. That is to say, I won't rely on others ____ (easy). My friends, what is your motto? If you still haven't got a motto, please choose ____ because a motto can have a great effect on you.

蛋白质是机体生长及修补受损组织的主要原料。人体通过食物获得的蛋白质在胃肠中与水反应生成氨基酸。蛋氨酸(C₅H₁₁O₂NS)就是其中的一种。请回答下列问题：

   (1)、蛋氨酸中各种元素的质量比m(C)∶m(H)∶m(O)∶m(N)∶m(S) ＝   ____           。

   (2)、蛋氨酸中氮元素的质量分数为    ____      。

   (3)、每100克合格奶粉中含蛋白质约18克，蛋白质中氮元素的平均质量分数为16%，则每100克合格奶粉中氮元素的质量为  ____       。现经测定每100克某奶粉中含有氮元素的质量为0.5克，则这种奶粉属于     ____     (填“合格”或“不合格”)奶粉。