Face–to–face conversation is a two–way process. You speak to me, I reply to you and so on. Two–way (1)     depends on having a coding system that is understood by both sender  and (2)     , and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (3)     in conversation and meetings are  often (4)         . For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (5) possible, more formal signals may be needed. 

(5) ..................

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