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) While President Trump and government officials develop plans for a "wall" between the U.S. and Mexico, the agency responsible for securing the border is uncertain how successful the current fence has been. The 654 miles of fence already lining the border have been breached more than 9,200 times between roughly 2010 and 2015, according to a report released Thursday by the Government Accountability Office (GAO), citing records from the U.S. Customs and Border Protection (CBP). The GAO report does not conclude fencing has proved ineffective — rather, it states CBP has not implemented a way to measure the effectiveness of the current fence on slowing down illegal entries.The impact of the current fence along the U.S.- Mexico border is unknown, a government study found.The fence has been breached more than 9,200 times in roughly five years. 
 Question:The CBP acknowledged the _ report, and said it would be implementing its recommendations.
Answer:
Government Accountability Office