• Topic Sentence
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  • There are many reasons why pollution in ABC Town is the worst in the world.
    The topic is "pollution in ABC Town is the worst in the world" and the controlling idea is "many reasons."
  • There are many possible contributing factors to global warming.
    The topic is "global warming" and the controlling idea is "contributing factors."
  • Dogs make wonderful pets because they help you to live longer.
    The topic is "dogs make wonderful pets" and the controlling idea is "because they help you to live longer."
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