Spoken language is a complex sequence of sounds. When we know the language, we have no difficulty in distinguishing consonants from vowels and in separating the sounds into individual words. When we hear a language that we do not know, it is more difficult to distinguish single words.

The human voice is 【A1】________of making a very large number of sounds, but the sound system of each language restricts the number of acceptable sounds 【A2】________a relatively small number. The sound stream of a language consists 【A3】________separate, ordered parts: syllables, words，phrases, clauses, and sentences. Understanding and learning language comes naturally to us 【A4】________the structure of language is so logical. Language has syntax, which means that syllables and words are organized 【A5】 ________meaningful constructions. Syntax is a condition of all human languages. 【A6】________controls the flow of information and expresses relationships.

One of the most interesting aspects of language is how it changes 【A7】 ________time. There can be changes in a language's sound system, such as a 【A8】________in the pronunciation of a vowel. Such a change affects the “color” of the speech but has no 【A9】________ on the meaning of a word Change can also come in the creation of 【A10】________words. Inventions, discoveries, and new contexts generate new words to describe them, words also disappear as there relevant contexts disappear

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