Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: We Are One--'Expo Through My Eyes' Sharing increases your happiness. To celebrate the 2010 Shanghai World Expo, China Daily invites you to share what you've seen, heard and experienced at the 6-month international event or Expo-related stories in ENGLISH. Whether you are an Expo volunteer, a journalist, or a tourist, we'd like you to share with us your expo experience, as viewed through your eyes. So if you like, please join us today in sharing the joy! Eligibility : Everyone Topic: 2010 Shanghai World Expo Language: ENGLISH Only Length: No more than 1,000 words Content: Stories accompanied  by photos are encouraged. Duration: May 1, 2010--October 31, 2010 How to _ your stories: Send your stories and photos to expo@chinadaily.com.cn Why join us: In addition to(......) the satisfaction of supporting our work. - Your stories will come out on China Daily's website; - You will go in a lucky draw to win a prize. 
 Answer: to win a prize
