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People always use the expression "a trip down memory lane" and nostalgic means longing for days of old so when they say that, they are saying a trip to the past which is nostalgic.

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Santa is always happy and wanting to help people he is very jovial and that's why I chose him.

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This person is looking out the window of the bus he is riding and probably reflecting on his day and planning his day ahead.

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They are giving the homeless person clothes and not looking for recognition which is what being humble is all about.