阅读下面的材料，根据要求写一篇不少于800字的记叙文。

很多时候，文化看不见摸不着；但它无时无刻不在我们身边。

按照要求选好角度，确定立意，自拟题目；不要脱离材料内容及含意范围作文，不要套作，不得抄袭。

用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。                                  

get,  look,  some,  year,  a,  write,  by,  tomorrow,  work,  other

      Tommy is a schoolboy. He's thirteen ____  old. He's in Class 3, Grade 1. He always____  up early and he often goes to school ____ bike. He likes English, Chinese and some ____ subjects. He enjoys singing and dancing. But now he is having ____ English class.____ ! some of the students are reading books and some of the students are____  the new words. They are ____  hard . But ____  is Saturday. They don't have ____ classes. He and his friends will go to the movies. I think they'll have fun.

若用(a，b)表示点P的坐标，当点P在横轴上时，b=____；点P在纵轴上时，a=____．

目前人类已发现的非金属元素除稀有气体外，共有16种。下列对这16种非金属元素的相关判断正确的是
①都是主族元素，最外层电子数都大于4；②单质在反应中都只能作氧化剂；③氢化物常温下都是气态，所以又都叫气态氢化物；④氧化物常温下都可以与水反应生成酸

 如图表示两种物质发生的化学反应，其中相同的球代表同种原子，小球间的短线代表原子间的结合．下列说法中不正确的是（　　）