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) -- The age rating for new mobile video-sharing app Vine has been raised to 17+, meaning appropriate for users 17 and older, after it was flooded with pornographic images. Since its launch two weeks ago, the Twitter-owned Vine had been rated 12+ in Apple's App Store, the only place it is currently available. But sexually explicit video clips almost immediately began appearing within the app, including one mistakenly showcased in its "Editor's Picks" section, drawing outrage from some users. The new rating, for such criteria as "frequent/intense sexual content or nudity," means users wishing to download Vine must click on a window promising that they are over 17. There is no age-verification system, however, and nothing to stop younger users from downloading the app.The age rating for new mobile video-sharing app Vine has been raised to 17+Sexually explicit video clips have been appearing within the appSince its launch two weeks ago, the Twitter-owned Vine app had been rated 12+ 
 Question:The issue made headlines January 28 when _ users noticed a video of what was described as hardcore pornography showcased in the prominent Editor's Picks section of the mobile app.
Answer:
Vine