The dictionary is often used to determine the correct spelling of words, or to find out the accepted pronunciation. But such【C1】______ is perhaps not the most important【C2】______ an intellectual point of view. Dictionaries may,【C3】______ , have social importance. It is often a matter of some【C4】______ to the person using the dictionary that he should not suggest to others, by misspelling a word in a letter, or mispronouncing it in conversation, that he is not【C5】______ . Yet,【C6】______ familiarity with the dictionary, the【C7】______ person is likely to have many wrong ideas about it, and no real【C8】______ of how to use it profitably, or【C9】______ it correctly. For example, it is often believed that the【C10】______ presence of a word in a dictionary is【C11】______ that it is acceptable in good writing. Though most dictionaries have a system of marking words as【C12】______ , or in use only【C13】______ slang, many people, more especially if their use of a particular word has been【C14】______ , are likely to conclude, if they find it in a dictionary, that it is accepted as being used by writers of established reputation. This would certainly have been【C15】______ of dictionaries a hundred years ago. For a long time after they were first【C16】______ established in the eighteenth century, their aim was to 【C17】______ only what was used by the best writers, and all else was【C18】______ , and the compiler frequently【C19】______ that his dictionary contained no 'low' words. Apparently this aspect of the dictionary achieved such importance in the mind of the average person the most people today are unaware【C20】______ the great change which has taken place in the compilation of present-day dictionaries. 【C1】