Fill in each blank with ONE suitable world

Fill in each blank with ONE suitable world. Athletic teenagers spend most of their free time playing sport. Some choose (11) ______ sports such as soccer, basketball, or volleyball. Others (12) _______ keen on individual ones like swimming or cycling. For these sportive children, the best free time means practicing their favorite sports in clubs or with partners. As a leisure (13) _________, sports benefit these children in couple of ways. Regular sports players are fitter, and they are taller (14) _________ those who don't play sports. Besides, they are more confident and competivite. When a teenager loves a sport, he can't stop (15) ________ it.