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].

Let me give you an 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.
The answer to this example can be: China
Here is why: This is a good example. Based on the passage, any cubs will return to China at the age of two

OK. solve this:
(CNN) -- It may not be as gripping as a spy novel, but things are heating up after the latest reports of espionage by the U.S. National Security Agency. International leaders say they're outraged and the Obama administration says it's investigating. Here are five key questions to keep in mind: 1. Are President Barack Obama's hands clean in this? It's not really clear. The Wall Street Journal reported an internal review of U.S. surveillance programs that started this summer revealed the NSA had tapped the phones of about 35 world leaders and that the White House ordered a halt to some of it.Media reports say the NSA tapped the phones of about 35 world leadersKey questions have emerged about what Obama knew, and his responseLeaders in Europe and Latin America demand answers, say they're outraged 
 Question:The explanation was backed by a former senior administration official who worked on national security for the Obama _.
Answer:
White House