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].
One example: For four years we have waited expectantly for the pitter patter of tiny paws. Soon, that wait could finally be over. Tian Tian, the UK's only female giant panda, has conceived and could give birth to a cub as early as August. However Edinburgh Zoo, where the pandas live, have warned people 'not to get too excited' as the process is 'extremely complex'. Moreover, on the two previous occasions keepers inseminated Tian Tian - whose name means 'Sweetie' - she has failed to produce a panda cub. She was artificially inseminated again in March this year, but keepers at the zoo say implantation - when a fertilised egg attaches to the uterus - has not yet occurred.Tian Tian has conceived and could give birth to a cub as early as AugustShe has been inseminated twice before but so far failed to produce a cubTian Tian and Yang Guang arrived in 2011 from China to great fanfareOn loan at £600k a year, became first giant pandas to live in UK for 17 years 
 Questions:Under the terms of the agreement any cubs will return to _ at the age of two, the age at which they would normally leave their mother in the wild.
Solution is here: China
Explanation: This is a good example. Based on the passage, any cubs will return to China at the age of two

Now, solve this: Federal prosecutors are reportedly preparing criminal corruption charges against New Jersey Democratic Senator Bob Menendez, the result of a grand jury probe that has lasted two years. Menendez, 61, has seen pressure from the Obama administration over his positions on Cuba and Iran. And he has long faced ethics questions about his relationship with Florida eye doctor Salomon Melgen, a wealthy and prolific donor. The senator's aides admitted in 2013 that he had intervened a year earlier with the acting chief of the Centers for Medicare and Medicaid Services on his friend's behalf, pushing back against accusations of overbilling the Medicare system by $8.9 million.New Jersey Sen. Bob Menendez could be charged in a matter of weeksAttorney general reportedly gave approval but insists 'I can't comment'Federal grand jury has been probing whether he traded political donations from eye doctor Salomon Melgen for improper government favorsMenendez spokeswoman says doctor has been 'one of his closest friends for decades' and insists everything he did was lawfulHHS accused Melgen of overbilling Medicare by $8.9 million and ordered him to pay it back; Menendez intervened about his caseSenator also paid Melgen back $58,500 for trips on the donor's private jet, calling his failure to reimburse him an 'oversight'Allegedly pressured US Customs to stop giving the Dominican Republic used cargo x-ray equipment so a company Melgen controlled would win a contract for new machinesHis aides refused to testify before a federal grand jury about conversations their boss had with HHS officials and a lawyer engaged to lobby for Melgen 
 Question:Other news reports described an alleged scheme in which Melgen used leftover fluid from single-use injection vials to treat two or three additional patients, billing _ for a new vial with each treatment.
Solution:
Centers for Medicare and Medicaid Services