SOFIA, April 10 (Xinhua) -- Hosts Bulgaria won seven of the eight gold medals and Greece took the remaining one at the FIG Rhythmic Gymnastics World Cup Series, which ended here on Sunday. The hosts dominated the individual competitions. After winning the all-around event on Saturday, Boryana Kaleyn swept the gold medals in the hoop, ball and ribbon competitions. Stiliana Nikolova won the clubs title and took a