Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

Q: sweep : broom. eat : ?

A: fork
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Q: eat : fork. spread : ?

A: knife
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Q: wash : soap. unlock : ?

A:
key
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