Which sentence is punctuated correctly?
Firefighters in our community serve twenty four hour shifts, then have seventy two hours off.
The puppy - who was six months old at the time - fell into the backyard pond and nearly drowned.
A five-year-old girl was reported missing, but was soon found wandering in the woods behind her house.
When Agnes turned twenty-one, she and her friends took a trip to Las Vegas - they had a great time.
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