Strong Lead or Topic Sentence?

Westward Expansion was the act of exploring the west that wasn't inhabited yet by Europeans.

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Soccer is a strenuous sport that is good for your muscles and your respiratory system.

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Have you ever tried the difficult sport of skiing?

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Did you know that some dogs can be trained to retrieve medicine for someone who is sick?

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Public schools are schools within communities that kids can go to for free.

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BOOM! The sound of a thunderstorm is a good warning sign to stay indoors.

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Unlike other birds of the world, penguins cannot fly, but can swim instead.

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One out of every three kids in America wants to play a sport on the weekends.

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