要求：1）表达清楚，语法正确，上下文连贯；

       2）必须包括所有相关信息，并作适当发挥；

3）100词左右(开头和结尾已给出，不计入总词数)；

4）不得使用真实姓名、校名和地名。

Dear teachers and classmates:

    Pollution is going more and more serious. ……

                                                          Students' Union

单词拼写
(1)I called you last night but you didn't answer me. What was h____ .
(2)I looked for my cat e____ , but I didn't find it.
(3)He is good at math, but he failed the exam this time. I can not i____  how strange it is.
(4)Both Tom and Tim have t____ to the ball game. They’ll go and watch it.
(5)Liu Yang becomes a national h____  because she is the first Chinese woman that has been to the space.
(6)Lily m____  her English teacher while she was shopping in the mall.
(7)There are still lots of p____  families in China. We should help them.
(8)This problem is too s____ . Even a kid can work it out.
(9)I had a car accident yesterday. L____ , there was nothing wrong with me.
(10)Do you make the bed for your parents?  No, they make the bed by t____ .

小张参加招考公务员考试，本次参加招考的总人数是1600名，规定：按考试成绩从高到低排列，前800名通过笔试，小张想知道自己是否通过笔试，他最应该了解的考试成绩统计量是（　　）

某钢铁厂用100t含氧化铁80%的赤铁矿炼铁，计算理论上可冶炼出铁的质量．