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].

Dallas, Texas (CNN) -- When Leo Manzano won second place in the 1,500-meters final at the Olympics, he celebrated his well-deserved victory by waving two flags, that of the United States and Mexico. He has every right to do so: After all, he has dual citizenship for both countries. Some observers disagree with Manzano's action. On CNN.com, Ruben Navarrette voiced his concerns that Manzano was showing disloyalty to the United States even while he's wearing the USA jersey. Opinion: U.S. Olympic athlete, Mexican flag? Judging by the volume of comments in response to Navarrette's opinion, one would think that Manzano had committed treason. One reader wrote, "He is pathetic. ... Go back to Mexico. You're either American OR NOT!!" OK, calm down. Let's not get too worked up here.Jesús Chairez: Leo Manzano has a right to wave two flags in his victory lap at the OlympicsChairez: Manzano has dual citizenship for the U.S. and MexicoHe says Manzano wanted the world to know that he didn't forget his heritageChairez: There is no doubt that Manzano loves America, his adopted country 
 Question:Viva to _ for being proud of who he is: someone who is American, but also has a part of Mexico in him.
Leo Manzano

Social media users have sprung the owner of a car that was involved in a hit-and-run after he put the vehicle responsible for the accident up for sale online. Footage of a black Ford Maverick hitting a small Nissan at a set of traffic lights at Sunshine in Victoria emerged on Dash Cam Owners Australia last week. As the driver of the damaged car began to emerge from his vehicle, the four-wheel drive was seen slowly reversing before mounting the curb and fleeing the scene. Footage of a black Ford Maverick hitting a small Nissan at a set of traffic lights was captured on a dash cam last weekA dash cam captured the driver of a black Ford Maverick hitting a NissanThe black four wheel drive then mounted the curb and fled the sceneDisgusted social media users soon found a similar vehicle for sale onlineMany have shared outraged text messages they have sent to the owner 
 Question:A large dent could clearly be seen in the back of the _, as the shocked owner surveyed the damage to his car.
Nissan

Jack Dorsey would have to give up his post at Square if he wants to become permanent CEO of Twitter. The company he helped found and now leads on an interim basis said Monday that it is only considering candidates who can make a 'full-time commitment to Twitter.' Dorsey was named interim CEO after Dick Costolo stepped down effective July 1 amid criticism over Twitter's disappointing financial performance and share price decline. Costolo had been Twitter's CEO for five years and led the company through a successful stock market debut in 2013. But Twitter has yet to make a profit and there are concerns about its ability to grow its user base.Costolo stepping down from his role beginning July 1Costolo faced controversies over online abuse and user numbersBoard only considering candidates who can make 'full-time commitment' 
 Question:_ has been under the microscope since going public in late 2013, and has struggled to deal with user growth issues that have seemed to show the company had hit a plateau.

Twitter