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.

“丝绸之路”

“丝绸之路”，从广义上讲并非只是丝绸贸易的通道，而是指中西方之间多元化、多层次、多维度的交流通道。假设你是一名历史学家，在研究“丝绸之路”的过程中，遇到了如下问题，该如何解决？

地球上的动物根据体内有无脊柱可分为无脊椎动物和脊椎动物，鸡、珊瑚虫、蜘蛛、狗四种动物中属于无脊椎动物的是____、____，属于脊椎动物的是____、____．

— Is that true? Maybe he has ________ teaching skills to make our class interesting.

温度越高，水的体积受热膨胀越大，液面上升越高。（  ）