Breathe through diaphragam , Lower pictes , speak too loudly and too shortly, Moderate your pace, Articulate, Practice your speech in advance and determine where you want to pause for a breath 
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Jst dont shout unnecessarily..jst chnge the tone of ur voice accrdng to the situation...
don't eat oily food regularly..nd the imp. one is during winter seasn don't eat cold items like ice cream..
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