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 Q]: Washington (CNN) -- President Barack Obama used a Memorial Day ceremony to say it is time for America to properly welcome home Vietnam veterans and show them and their families the respect and gratitude they deserved but didn't receive decades ago. "You came home and sometimes were denigrated when you should have been celebrated," Obama said beneath a scorching sun at the Vietnam Veterans Memorial. "It was a national shame, a disgrace that should have never happened. That's why here today, we resolve that it will not happen again." The event, which launched a 13-year Vietnam War 50th anniversary commemoration, was the culmination of a day of somber events on the annual holiday honoring America's war dead.NEW: President Obama calls the denigration of Vietnam veterans a "national shame""America will be there for you," Obama tells veterans and their familiesMemorial Day launches a 13-year commemoration of the Vietnam War's 50th anniversaryObama lays a wreath to the fallen at Arlington National Cemetery 
 Question:This year marks the 50th anniversary of the _ deploying a significant military presence in Vietnam.
[EX A]: America

[EX Q]: Niko Matawalu's two-try cameo fired England a World Cup warning as Fiji dispatched Canada at The Stoop on Sunday. The Bath-bound scrum-half bossed Fiji's fluent, potent back line under the shadows of Twickenham, 13 days before the Pacific Islanders will look to spoil England's World Cup party. Matawalu limped off gingerly just before half-time with a leg injury, but was clearly removed as a precaution and under little panic. The 26-year-old's class is underscored by his ability to stand out as Fiji's biggest threat even in a back line dripping with strike runners and match-winners. Watching coaches Stuart Lancaster and Andy Farrell were left in little doubt as to who will pose them the greatest threat when England open their World Cup campaign against Fiji a week on Friday.Fiji fired England a World Cup warning as they easily dispatched CanadaBath-bound scrum-half Niko Matawalu impressed and scored two triesStade Francais wing Waisea Nayacalevu claimed a brace of his own 
 Question:Canada hit back with tries from Conor Trainor and a late brace from Phil Mackenzie as _ tired and fell off the pace.
[EX A]: Fiji

[EX Q]: NEW YORK (CNNMoney.com) -- U.S. President Barack Obama set his green plan into action Monday, potentially reversing several Bush-era decisions on global warming and fuel efficiency. U.S. President Barack Obama signs orders Monday on vehicle emissions and fuel efficiency standards. In his first major environmental acts as president, Obama directed his Environmental Protection Agency to review a California application to regulate greenhouse gases and told his Department of Transportation to begin implementing fuel efficiency standards passed last year but not implemented by the Bush administration. He also pushed for passage of the $825 billion economic stimulus package in the House and Senate. Those bills include money for investments in renewable energy, conservation and a better electric grid.Obama orders review of California request to regulate greenhouse gasesU.S. president orders government to implement fuel efficiency standardsAutomakers oppose plan as an expensive patchwork of lawsFormer President George W. Bush stopped earlier attempt for state standards 
 Question:Seventeen other states may adopt California's rules if the _ administration allows it, representing over half the vehicle market.
[EX A]:
Barack Obama