Final answer:
An effective speaker should vary the pitch of his or her voice, get physically close to the audience, and not be afraid of silence.
Step-by-step explanation:
An effective speaker should vary the pitch of his or her voice. Pitch refers to how high or low a speaker's voice is to listeners and can be used to emphasize points, communicate enthusiasm, and indicate transitions or closure. In addition to varying pitch, an effective speaker should also get physically close to the audience to create a sense of connection and engagement. Lastly, an effective speaker should not be afraid of silence and can use it strategically to create impact and allow the audience to process information.