Q:I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "On Children's Day, June 1, 2008, many parents went to the rubble of schools to mourn for their children. The surviving children, who were mostly living in relief centres, performed ceremonies marking the special day, but also acknowledging the earthquake."?
A:
What was the reason for being sad?