You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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].

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: China
Why? This is a good example. Based on the passage, any cubs will return to China at the age of two

New input: A Russian biker gang, which Vladimir Putin describes as his 'friends', has camped out on the Polish border after being banned from entering the country for a World War II memorial ride. Polish authorities said last week they would ban entry to the Night Wolves, with leaders calling their plans to ride through Poland en route to commemorations of World War II a 'provocation'. The group vowed to enter anyway and 15 were seen Monday morning at the border crossing between Brest, Belarus, and Terespol, Poland. Scroll down for video Stopped: A Belarussian border guard checks the passport of a member of Russia's pro-Putin Night Wolves motorcycle club at a border crossing with Poland near BrestThe Night Wolves biker gang has been banned from entering PolandThey are pro-Putin, and the Russian leader has ridden with themPoland is extremely critical of Russian actions in UkraineGermany has also said that the Russian bikers would not be welcome 
 Question:Some Russian bikers had been seen entering _ earlier but they appeared to belong to another organisation whose members are allowed to enter.
Solution:
Polish