The <em>word </em>which best completes the sentence about new media and its use of new words for this new form of communication and the thing to adjust when <em>talking to a person</em> is:
<u>Tone</u>
According to the given question, we are asked to show what a speaker needs to adjust when he is communicating with a person and making use of new words.
As a result of this, we can see that although the question is not <em>comprehensive enough</em>, we can see that when communicating in a new form to someone else, it is <em>important </em>that the speaker adjusts his tone so that the person he is speaking to would not misunderstand his intentions.