Idiom
A fool's errand

None of these
A useless undertaking
An impossible task
A blunder

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Idiom
A black sheep

A lucky person
An unlucky person
None of these
An ugly person
A partner who takes no share of the profits

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Idiom
Will o' the wisp

Anything which eludes or deceives
To act in a foolish way
To have desires unbacked by efforts
To act in a childish way

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