In preparation for your speech you can use the following suggestions (from http://www.best-speech-topics.com)
1. Expository speeches are speeches that inform audiences about an idea or a process. You would help your audience to either understand the process or actually perform the process.
2. The second category of expository speeches encompass those that discuss a past or current events. In this type of speech, you would offer audience members a clear idea of the main circumstances that occurred during the event you are speaking about.
3. The final category of speech topics is the definition speech topic. This speech could be about anything that is either tangible, alive or visible.
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Expository Essay Topics.