You will be given a definition of a task first, then some input of the task.
In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

When does the ordinary -- letters, gloves, wallets -- become extraordinary? When the objects tell a story: a stack of personal letters that fell to the ground after a hijacked plane plowed into the World Trade Center; leather gloves worn in the recovery effort; a red wallet belonging to a woman who worked for Cantor Fitzgerald. Tragedy turns the mundane into memorial. Something as simple as a wallet can evoke the immense sadness of a day like September 11, 2001. Objects big and small from the greatest terrorist attack on American soil now make up a museum dedicated to that tragedy and the 2,983 people who perished. It is one of America's largest and most ambitious memorial museums, almost entirely subterranean and erected in the graveyard of Osama bin Laden's victims.National September 11 Memorial Museum is open to the public in New YorkThe exhibition halls are filled with personal things as well as oral histories and photosMuseum curator had the difficult task of deciding how much tragedy to showThe museum is also about how people can be good to one another in times of crisis, curator says
Output:
On Day 3, he helped carry out three bodies from 6 _ and paused to look out at the destruction.