Find the mistake.

They phoned theirs friends last night, but no one answered.

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_______ and young adults, both male and female, benefit from physical activity.

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This type of housing is large and beautiful. Building it is expensive.

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This is a type of boat that people use for racing or leisure travel that has sails and possibly an engine.

They know _______ address, but we don’t know _______.

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Our teacher broke the final project _______ three separate parts.

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What does a dentist take care of?