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].

Archaeologists say they have unearthed the oldest human footprints ever found in North America. The impressions were discovered buried at a shoreline at an archaeological dig site on Calvert Island, British Columbia in Canada. Charcoal in the prints has been radiocarbon dated, giving them an age of 13,200 years old. The finding was made by the Hakai Institute and the University of Victoria, both in British Columbia. Archaeologists Dr Daryl Fedje and Dr Duncan McLaren excavated an area below the high tide line, and found dozens of human footprints that had remained intact in clay. An ancient skeleton found nearly 20 years ago in a river in Washington is related to Native Americans, says a DNA study that could help resolve a long-running dispute over its ancestry.Human footprints were found preserved on Calvert Island in CanadaThey were radiocarbon dated to a remarkable 13,200 years oldIf confirmed they would be the oldest human footprints in North AmericaDiscovery also suggests people once migrated down the coast 
 Question:'There's no way to get to _ other than watercraft, and that applies to 13,000 years ago as it does today,' Dr McLaren said.
Calvert Island

(CNN) Not long ago, retired New York City firefighter James Hanlon and his five-year-old daughter were hanging out in the family garage. The girl spotted an unfamiliar box containing Hanlon's dusty, banged up old firefighter's helmet. "Dada, what's that?" she asked. Hanlon's mind raced back 15 years when he and hundreds of other first responders rushed inside the World Trade Center after terrorists flew hijacked airliners into the North and South Towers. "Oh, that's what Daddy used to do for a living," he explained. She tried to ask a few questions, Hanlon recalled during a recent interview for the documentary, "9/11: Fifteen Years Later."9/11 firefighters reflect on 15th anniversary and new anti-terror tactics"Everything is about fear and who to be afraid of," says firefighter who survived terror attacks 
 Question:Losing friends and colleagues has made _ feel a "responsibility to live my life the best as I can for those who are not here."
James Hanlon

Kuala Lumpur, Malaysia (CNN) Seven suspects -- all of them younger than 19 -- have been arrested in connection with a fire at a school in Malaysia's capital that claimed the lives of 21 students and two adults, state-run media outlet Bernama reported Saturday. The suspects, who range in age from 11 to 18, were "school leavers and dropouts," Kuala Lumpur Police Chief Datuk Amar Singh Ishar Singh said Saturday during a news conference. They were arrested by Royal Malaysian Police, Bernama reported. The investigation into the fire's cause continues, Singh said. Witnesses reported being awoken Thursday by cries for help from inside the burning building, where children appeared trapped by metal window grills.Suspects, ages 11 to 18, were "school leavers and dropouts," police chief saidDNA tests may be needed to identify badly burned victims, another police official said 
 Question:Asked about younger victims, he said _ testing would be required.

DNA