What is a topic sentence for..." World Hunger"?

I am doing a powerpoint and need 20 topic sentences. or:I am doing a powerpoint and need 20 topic sentences.or:If you don't know what you are talking

I am doing a powerpoint and need 20 topic sentences.

or:I am doing a powerpoint and need 20 topic sentences.

or:If you don't know what you are talking about then you just need to get your nose in the books and learn it. The only things you need to be an effective public speaker are something to say and a burning desire to say it. You have to provide both those by yourself. The alternative is called \"actor\". If you want to be an actor, there are classes for that too.

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