 Complete the following phrase:  In May 2012, Arenas won the womens 10 kilometer event junior event at the 2012 IAAF World Race Walking Cup in Saransk, Russia. In July 2012, Arenas won the bronze medal in the 10km race walk event at the 2012 World Junior Championships in Athletics with a time of 45:44.46. Arenas placed 32nd in 