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ACROSS
1)  the state of being or appearing to be actively engaged in an activity
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  a facial expression of contempt or scorn; the upper lip curls
4)  a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)


DOWN
1)  one of two equal parts of a divisible whole
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  a ____ing at which a number of athletic contests are held
4)  a respiratory disease of unknown etiology that apparently originated in mainland china in 2003; characterized by fever and coughing or difficulty breathing or hypoxia; can be fatal

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