阅读下面短文，掌握其大意，并根据所给字母的提示，写出一个英语单词的完整、正确形式，使短文通顺。

    More and more A____ are going to work by bike. Do you know why more people are riding bikes to work? We can answer the question in d____ ways. First, bikes don't need gasoline(汽油)，so it takes little m____ to use them. S____  a bike doesn't need much space, so it is e____ to find a place for it. And to ride a bike is good for one's h____ .People often d____ their cars to offices or to shops in the past. But now people think riding bikes is a good way of d____ sports. That's w____ more Americans are now riding to work by bike, and they are leaving（把...留下）their o____ cars at home.

已知函数$f\left(x\right)=x^n+a_{n-1}{x}^{n-1}+a_{n-2}{x}^{n-2}+\cdots +a_{1}x+a_0$（n＞2且n∈N﹡）设$x_0$是函数f（x）的零点的最大值，则下述论断一定错误的是（   ）

读课文《动物过冬》填空。

①燕子、杜鹃、黄鹂它们到____去过冬，明年____才回来。

②喜鹊把窝垫得____的，就在北方过冬。

③青蛙要____了，整个冬天都____，不____也不____。明年春天再出来。

④蚂蚁准备好过冬的____，在____过冬。