We use language primarily as a means of communication with other human beings. Each of us shares with the community in which we live a store of words and meanings as well as agreeing S1.______ conventions as to the way in which words should be arranged to S2.______ convey a particular message; the English speaker has in his dis- S3.______ posal a vocabulary and a set of grammatical rules which enables S4.______ him to communicate his thoughts and feelings, in a variety of styles, to the other English speakers. His vocabulary, in particular, S5.______ both that which he uses actively and that which he recognises, in- creases in size as he grows old as a result of education and S6.______ experience. But, whether the language store is relatively small or large, the system remains no more than a psychological reality for the indi- vidual , unless he has a means of expressing it in terms able to be seen by another member of his linguistic community; he has to give S7.______ the system a concrete transmission form. We take it for granted the S8.______ two most common forms of transmission—by means of sounds pro- duced by our vocal organs (speech) or by visual signs (writing). S9.______ And these are among most striking of human achievements. S10.______