根据短文理解，用括号所给单词的正确形式填空。 People {#blank#}1{#/blank#} （live） in different countries made different kinds of languages. Today there are about fifteen hundred {#blank#}2{#/blank#} in the world. Each contains many thousands of words. A very large dictionary, for example, contains four {#blank#}3{#/blank#} five hundred thousand words. But we do not need {#blank#}4{#/blank#} these. To read short stories you need to know only about two thousand words. {#blank#}5{#/blank#} 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 {#blank#}6{#/blank#} （big）. Read as many books as we can. There are a lot of books {#blank#}7{#/blank#} （write） in easy English. You will enjoy them. When you meet {#blank#}8{#/blank#} new word, look it {#blank#}9{#/blank#} in your dictionary. Your dictionary is your {#blank#}10{#/blank#} （much） useful book.
