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: (CNN) Squeals of delight echo around the room at Vanderbilt's Children's Hospital in Nashville, Tennessee. Nine-year-old cancer survivor Bryce Greenwell turns to his mother, Jenny. "Did you know about this?" he asks, hands cupped to his face in surprise. "Yes," she says with a nod, smiling from ear to ear. "Oh, my gosh, he has missed you guys so much!" pet therapist Michelle Thompson says as she hands Swoosh, her trained toy Pomeranian, over to two eager boys. "Did you miss him? He talks to me about you boys all the time." "I haven't seen him in a long time," says 7-year-old Mitchell Montalbano, who recently graduated from chemotherapy treatment, cancer-free. "Swoosh, what have you been up to?"Two boys who were treated for cancer treasured their time with therapy dog SwooshA new study looked at the impact of therapy dogs on children and their parents 
 Question:"It was after those first few visits with _ that he would say, 'OK, you know, I'm not going to die.

A: Swoosh
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Q: When a husband and wife fleeing Syria made it all the way from their war-torn country safely to Greece in a life raft - with their beloved kitten in tow - the story went viral. Shortly afterwards, Al Kadri, 26, and his wife Nadia arrived in Germany, where they now live, but Zaytouna the tabby cat was quarantined and amid the chaos and the language barrier, it was unclear whether they could ever get her back. But after fearing that their feline had been put down under stringent immigration regulations, the pair were delighted to be reunited with her a few months later when she was delivered to their door.Al Kadri, 26, and his wife Nadia, arrived in Greece from Syria by seaBrought their kitten Zaytouna with them in a home-made slingUpon arrival at refugee camp in Germany, the cat was quarantinedGovernment official found them and returned Zaytouna by surprise 
 Question:Mr Kadri told Buzzfeed: '[A government worker] told me in most cases when people bring their pets from Syria they just kill the animal,' yet it was that same worker who surprised the couple months later by bringing _ back to them.

A: Zaytouna
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Q: (CNN) Every day we learn more about the scale and effectiveness of Russian influence operations during the 2016 US election. The implications for our political process are ominous, but the problem runs much deeper. For years hostile foreign governments, terrorist groups, and armies of internet trolls have manipulated public discussion, both in the United States and around the world. We must understand Russia's manipulative attack during last year's presidential elections in a broader context: as a relatively traditional propaganda operation that achieved unprecedented reach because social media companies are either unable or choose not to defend themselves. Every time our society falls victim to an information attack, we blame the attacker, but not their weapons. It's hard to accept that the platforms we use to chat with friends and share baby photos can have such a powerful impact in shaping democracy. Platforms like Google, Facebook, and Twitter have fundamental flaws that must be fixed if we're going to protect ourselves in the future.Jonathon Morgan: For years hostile governments, terrorist groups, and internet trolls have manipulated public discussionSocial media and government have to take steps to prevent this, Morgan says 
 Question:They were manipulating the underlying mechanics of social media, tricking platforms like _, Tumblr, and YouTube into amplifying their message to the widest possible audience.

A:
Twitter
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