Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Jessica Ennis-Hill said it would be among her greatest feats if she can win a medal at the World Championships in Beijing, barely a year after giving birth to her first baby. The Olympic heptathlon champion said she was focused on bringing back some hardware to prove the wrench of a long spell away from her one-year-old son – who has remained at home in Sheffield with husband Andy – has been worth it. ‘This is definitely my hardest challenge, being away from Reggie for this amount of time for the first time,’ said Ennis-Hill, who is at a training camp in Fukuoka, Japan, before travelling to China.Jessica Ennis-Hill is eyeing glory at the World Championships in BeijingOlympic heptathlon champion says it would be among her greatest featsEnnis-Hill reveals difficulty at being away from her son and husband AndyKatarina Johnson-Thompson, Ennis-Hill's young rival, is aiming for goldBritish pair face stern competition from Canada’s Brianne Thiesen-Eaton 
 Question:It is the unknown that adds spice to the battle for the medals in the heptathlon, which begins on Saturday with Ennis-_’s strongest event, the 100m hurdles.

Hill