Since означает "с какого-то времени" - since 5 o'clock=с 5 часов, since Monday=с понедельника.
My friend's name is Mary. She is 12 years old. He hobby is dancing. She dance very well. She is a very kind girl. Her eyes is green and her hair is brown. She likes healfy food and she don't eat meat. We go together to school and for a walk. She has got dog. His name is Foot. I love her and she love me.
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