People living in different countries made kinds of words. Today there 61______ (be) about fifteen hundred languages in the world. Each 62______ ( contain) thousands of words. A very large dictionary, for example, has four 63 ________ five hundred thousand words. But we do not need all these. 64________ (read ) short stories , you need to know only about two thousand words. When you leave school, you will learn only one thousand or more. The words you know are called 65______ (you) vocabulary. You should try to make your vocabulary 66______ (big). Read as many books as we can. 67______ (write) in easy English, lots of stories in the books are enjoyable to read. 68_______ you meet a new word, look it 69______ in your dictionary. Your dictionary is your most 70 _____ ( use) book.