Alternate the pace of your voice. By speaking at different speech rates for short periods, you can add some energy and dynamic flow to your speech pattern. Slow down for important points. By slowing your speech rate for key points, you can verbally emphasize to your audience that what you are saying is very important. Use the pause.
Silence is an excellent exclamation point.
By slightly extending a pause, you can add emphasis and importance to the key points in your presentation. All presenters pause. Before presenting, have a glass of water. Water will prevent potential voice problems during your presentation. News anchors provide some of the best examples of effective voice usage.