Ameliorate the Brooklyn Bridge

Directions: grammatically correct the sentence below. There are three missing commas, and one missing apostrophe.

 On May 17 1884 P. T. Barnum helped to squelch doubts about the Brooklyn Bridges stability when he led a parade of twenty-one elephants over the Brooklyn Bridge.

Suggested Answer:
 On May 17, 1884, P. T. Barnum helped to squelch doubts about the Brooklyn Bridge's stability, when he led a parade of twenty-one elephants over the Brooklyn Bridge.

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