Underline the mistake and correct it.
16. If you have worked harder, you would have passed your exam.
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17. Mel Gibson, whom played Hamlet, is one of my favorite actors.
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18. The little boy’s mother bought him a five-speeds racing bicycle for his birthday.
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19. Children enjoy telling and listening to ghosts stories, especially on Halloween night.
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20. No one would have attended the lecture if you told the truth about the guest speaker.
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