 Complete the following phrase:  Cristina Bontaş later Tăntaru, born 5 December 1973 is a Romanian former artistic gymnast, who competed in international events between 1987 and 1993. Her best events were the floor exercise, the vault, and the all around. She is a world champion on floor, a double olympic medalist and a six-time world medalist. Bontaş scored a perfect ten on floor in the all around event of the 