Find the simple subject in this sentence:

How much does sugar contribute to tooth decay?

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Answer my questions!

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Is Hawaii the most southerly state in this country?

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From somewhere in the back row came a burst of laughter.

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There is an old campsite in the woods.

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Only once before had the town staged a welcome-home parade.

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Go to sleep now.

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Under my bed were the missing keys.

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Stop tapping your fingers on the table!