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: Rio de Janeiro (CNN) A showcase of Brazilian culture will wrap up the 2016 Summer Olympic Games in Rio Sunday with the staging of the closing ceremony at Maracana Stadium. Organizers said more than 41,000 tickets have been sold for the event but there are still spots available, ranging from 600 reais to 3,000 reais ($187 to $936 USD). Most of the details are being kept under lock and key, but organizers have released some information about the giant party. Rosa Magalhaes, the creative director for the closing ceremony, said it will be a festive atmosphere with a touch of melancholy.Closing ceremony begins Sunday at 7 p.m. ET12,000 volunteers will take partBrazil's acting President will not participate 
 Question:Magalhaes noted that while the _ is a great venue, it does present some challenges for the creative team, especially when trying to recreate the big samba floats that Rio's carnival is known for.

A: Maracana Stadium
****
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.

A: Barack Obama
****
Q: (CNN) -- Champion cyclist Lance Armstrong refiled a lawsuit Tuesday against the U.S. Anti-Doping Agency in a bid to halt a doping case against him. One day earlier, a federal judge threw out Armstrong's original suit, blasting the seven-time Tour de France champion in a sharply worded ruling. In his brief order, U.S. District Judge Sam Sparks wrote that the case was full of legally irrelevant claims "included solely to increase media coverage of this case" and stir up hostility toward USADA. He urged the cyclist to refile his lawsuit without "any improper argument, rhetoric, or irrelevant material." Like the original, the refiled suit asks the court to file an injunction against USADA by Saturday, the agency's deadline for Armstrong to agree to contest the charges or accept sanctions. It is substantially shorter than the original lawsuit, by about 55 pages.NEW: Cycling champ Armstrong asks the court to file an injunction against USADAHe refiles one day after a judge dismisses lawsuitThe seven-time Tour de France winner faces doping chargesHe says he has never tested positive for performance-enhancing drugs 
 Question:It contends _ "does not have the right to force him to arbitrate those charges without a valid, enforceable legal agreement to do so."

A:
U.S. Anti-Doping Agency
****
