4. Complete the following text with the words or phrases from the box (using them in the appropriate form).

It is fairly obvious that language is used _____ a variety of different _____, but until we examine its grammar there is no clear reason for _____ its uses in any particular way. However, when we _____ the meaning potential of language itself, we find that the _____ numbers of options embodied in it combine into a very _____ relatively independent ‘networks’; and these networks of options _____ to certain basic functions of _____.