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 shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

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 August. She 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
Solution: 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.
Why? This is a good example. Based on the passage you can answer this question.

New input: (CNN) Two chemical gas attacks have been reported in northern Syria, one in the region where a Russian helicopter was downed a day earlier, killing all five people on board. In the first alleged attack, cylinders suspected of containing chlorine gas were dropped in residential areas in the city of Saraqeb in Idlib province, the anti-regime, voluntary search-and-rescue group Idlib Civil Defence said in a post on its Facebook page. Russia, Syria's key military backer, has vehemently denied that a chemical attack took place. In a news release carried by Russian and Syrian state news agencies, Kremlin spokesman Dmitry Peskov said the claims of chlorine usage were fabricated by the media.Confidence growing among U.S. officials that incident in Saraqeb was a chemical attack, source saysSyrian government says five dead in Aleppo gas attackActivists say 30 people have breathing difficulties in alleged Idlib attack
Solution:
The _ and Russian governments say three humanitarian corridors have been opened to allow for the distribution of badly needed food and medical aid to civilians and to provide residents -- along with rebels who choose to surrender -- the opportunity to leave.