If you follow the news you may be able to think of some events recently featured in the news.
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You can browse topics by date.
Narrowing a topic means thinking of different aspects, or angles, of the topic.
For example, for the topic ECONOMIC CRISIS, you could research:
Any of these aspects or angles could be a speech topic by itself. Or, you could choose two or three to cover as points in your speech.
Try narrowing your topics by asking yourself: Who, What, When, Where, Why