by 
Anonymous
ANSWERS: 4
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Unless they all share the same mouth (and that's an oddly disturbing graphic), it would be "their mouths."
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Their mouths.
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If they all share a mouth, it would be their mouth. Otherwise, it is their mouths.
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If any person leaves their jaw hanging open, they should close their mouth. (In a singular sense) Those people over there should close their mouths. (In a plural) Typically, "their mouths" is the right answer.
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