 Complete the following phrase:  Having competed at all World Championships between 2009-17, Genzebe placed in the finals of all events in which she took part. She won five World Indoor Championships titles, twice in the 1500 m and three times in the 3000 m. Genzebe was highly successful as a junior athlete. In 2008, aged 17, she won her first under-20 World Cross Country Championships title and took silver in the 5000 m at the 