帮我写几句有关数字的英文句子!只要5句就可以了.关于数字的一切都行.想到什么就写什么~晚上就要!PS:要介绍数字的或数字故事~

One plus one is two.
Now it is Beijing time nine o'clock.
October the first is the National Day.
This building is 400 meters high.
This article can be divided into 3 parts.

There is a book on the desk.There are two apples on the tree.I have seen three persons over there.Can you offer me four pieces of paper?Thanks for the five suggestions.