Fill in the blank with a suitable preposition:

Smoking ___ public places is not allowed (in,at).
Also give a suitable reason for your answer.


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It is in as to denote places(comparatively larger) like World,Asia etc.In is used.
But at is used to denote comparatively smaller places like airport,hotel,etc.
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Your answer is "in"

Here "in" is appropriate according to the situation because here it refers to being within an area (public places). "At" refers to a particular location that is more specific.
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What are you looking for?