Cute puzzle

Yesterday was engaged with his daughter. Charming 6 year old girl trying with the cards I mysteries of the alphabet (Child intensively preparing to enter the school).
And here's one of them:
 - The whole day standing on the street,
Passers-by smile.
Their service begins,
When it was getting dark.
I guess I was very tired at work, but in my head came only one answer. Yes, confused. But I did not articulate it, but simply said he did not know. It turned out that I was wrong, and the street lights are smiling ...


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