Preposition of place in on at

They are sitting ______ the table.

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I want to spend a year _____ Barcelona

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The milk isn't ________the fridge. Where is it?

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Is Peter's office _________the first or the second floor?

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Are you _______ home?

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Please, call me when you are _________ the bus.

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Mark lives ______ 55 Oxford Street.

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London is ______ the River Thames.

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Who is this girl______the photo?

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I did post _______Instagram

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