题目内容：

People __1._ (live) in different countries made different kinds of words. Today there are about fifteen hundred _2.___ in the world. Each contains many thousands of words. A very large dictionary, for example, contains four _3.___ five hundred thousand words. But we do not need _4.__these. To read short stories you need to know only about two thousand words. _5._ you leave school, you will learn only one thousand or more.

The words you know are called your vocabulary. You should try to make your vocabulary 6._ (big). Read as many books as we can. There are a lot of books _7.__ (write) in easy English. You will enjoy them. When you come across _8.__ new word, look it _9.___ in your dictionary. Your dictionary is your _10._ (much) useful book.