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].

Q: Beijing (CNN) China -- North Korea's only global ally and biggest trading partner -- has put on a stoic face since Pyongyang successfully conducted its sixth nuclear test Sunday. President Xi Jinping didn't mention his country's unruly neighbor at all in his closing address at the BRICS summit of emerging economies Tuesday, or in earlier speeches, although a communique issued by the group expressed deep concern and called for the crisis to be settled peacefully. But the test of a hydrogen bomb couldn't have sat well with China's leader. It's the third time in one year that North Korea has overshadowed a major Chinese event -- previous missile tests coincided with the unveiling of Xi's global economic blueprint at his Belt and Road summit in May and the G20, which China hosted last September.Voices in China diverging from official line on North Korea policyNuclear test seen as an embarrassment to Xi JinpingXi makes no reference to North Korea in closing summit speech 
 Question:"But if it hopes to see _ resolve the issue, it simply won't work," he added.

A: China
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Q: 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.

A: Calvert Island
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Q: (CNN) -- Marlene Monteolivo was a Democrat for many years, then a Republican. Now she's registered as a nonpartisan voter in Nevada who wants to support a candidate who will make the economy better. The Colombia native, who works for a Las Vegas social services agency, says she's leaning toward GOP challenger Mitt Romney. She likes his business sensibilities. But there's a hiccup. And it's a big one called immigration. It's the 200-pound anchor on the Republican message, say experts in Nevada politics. Many Latino voters will tell you "It's immigration, stupid," in the vein of the famously coined phrase on the economy during Bill Clinton's 1992 campaign.Some Latinos in hard-hit Nevada are considering voting for Mitt RomneyBut for many, immigration is a deciding issueOne GOP activist says his party has not done enough to connect with LatinosHe says President Barack Obama's appearance with Mexican band Mana was great strategy 
 Question:"With the economy as bad as it is, you would think lot of people would blame _ and say, 'Let me give Mitt Romney a shot,' " Maffatt says.

A:
Barack Obama
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