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].

Ex Input:
Nicolas Hamilton, the younger brother of Formula One world champion Lewis Hamilton, is to compete in this season’s British Touring Car Championship. Hamilton, who has cerebral palsy, will make his debut in June and becomes the first disabled driver to compete in the series. The 22-year-old will take part in five of the 10 rounds at Croft, Snetterton, Rockingham, Silverstone and the final meeting of the championship at Brands Hatch. Scroll down for video... Nicolas Hamilton posed a picture with his British Touring Car. The Briton said 'it's been a tough few months' Nicolas Hamilton, pictured with his older brother Lewis at the Indian Grand Prix in 2013Nicolas Hamilton will take part in five of the 10 championship roundsThe 22-year-old lives with the neurological condition cerebral palsyHe competed in the Renault Clio Cup in 2011 and 2012Nicolas is the younger brother of F1 world champion Lewis Hamilton 
 Question:Nicolas' brother Lewis Hamilton is bidding to become the first _ to successfully defend his Formula One title.

Ex Output:
Briton


Ex Input:
Washington (CNN) North Korea might not be able to reach the U.S. mainland with a nuclear weapon yet, but the political fallout from its claimed hydrogen bomb test is here already. Even before the shockwaves of the 5.1 temblor triggered by Tuesday's test wore off, Hillary Clinton was fighting off a volley of Republican attacks, GOP presidential candidates were talking tough and Donald Trump jumped on a chance to chastise China. The episode was a fresh indication of the challenge that Clinton faces in running for the White House on her record as secretary of state, which makes it impossible for her to escape deficiencies in President Barack Obama's national security legacy.The episode is a fresh indication of the challenge that Clinton faces in running for the White House on her record as secretary of stateWashington has tried punishment and inducements repeatedly with North Korea and has failed to change its calculations 
 Question:He then toughened his stance by including _ in his "axis of evil."

Ex Output:
North Korea


Ex Input:
Washington (CNN) -- Unmanned aircraft patrolling the nation's borders have an accident rate seven times greater than general aviation aircraft, and hundreds of times greater than the rate of jetliners, federal officials said Thursday in urging caution in expanding the use of pilotless planes. Unmanned aerial vehicles, or UAVs, have proven remarkably useful in the skies over Iraq and Afghanistan, but are difficult to integrate into U.S. skies, the most complex airspace in the world, FAA official Nancy Kalinowski said in testimony before a House Homeland Security subcommittee. Kalinowski said the accident rates for Customs and Border Protection (CBP) aircraft are based on a relatively limited use of the planes -- only 5,688 flight hours. But because of the limited data, "the FAA must make conservative decisions" concerning integrating UAVs into U.S. skies, Kalinowski said.Unmanned aircraft have higher accident rates than regular aircraftThe FAA urges caution in expanding the use of pilotless planes in the United StatesAn FAA official told a House subcommittee that the agency must make conservative decisions on the issue 
 Question:Public operators of UAVs such as the government and universities must obtain a special _ certificate of waiver or authorization before operating in U.S. civil airspace.

Ex Output:

FAA