Is it best to keep your audience interested while giving a speech?

There are a lot of great techniques when giving a speech. You should emphasise words with emotion. Speak in a booming voice and always look around at the audience (try to not look at inanimate objects). Add funny/surprising quotes into your speech. Size up and organize your speech so the audience is never bored. Most importantly, fell confident about your speech and think to yourself, "I'm going to do great!"...