We use language every day. We live in a world of words. Hardly any

　　moment passes with someone talking, writing or reading. Indeed, __1__

　　languages is most essential to mankind. Our lives increasingly depend

　　on fast and successful use of language. Strangely enough, we know __2__

　　more about things around us than on ourselves. For example, language __3__

　　is species specific, that is, it is language that differs human from __4__

　　animals. However, we do not know yet how exactly we inquire language __5__

　　and how it is possible for us to perceive through language; nor we __6__

　　understand precisely the combinations between language and thought, __7__

　　language and logic, or language and culture; still less, how and when

　　language started. One reason for this inadequate knowledge of language

　　is that we, like language users, take too many things for granted. __8__

　　Language comes to every normal person so naturally that a few __9__

　　of us stop to question what language is, much less do we feel the

　　necessity to study it. Language is far more complex than most people

　　have probably imagined and the necessity to study it is far greater than

　　some people may have assured. Linguistic is a branch of science which __10__

　　takes language as its object of investigation.