When you give a speech, you should try to have the same expressiveness in your voice as you have in ordinary conversation. true?

True because you want your audience to see your expression and follow you while you speak. If you speak monotone when giving your speech you might lose your audience attention. So the answer is TRUE

Refute it, showing why it is mistaken—an apparent but not real problem; acknowledge its validity or plausibility, but suggest why on balance it's relatively less important or less likely than what you propose, and thus doesn't overturn it; concede its force and complicate your idea accordingly—restate your thesis in a more exact, qualified, or nuanced way that takes account of the objection, or start a new section in which you consider your topic in light of it. this will work if the counterargument concerns only an aspect of your argument; if it undermines your whole case, you need a new thesis.