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: Donald Trump has renewed his calls for tougher immigration controls in the wake of an illegal Mexican migrant allegedly murdering a woman in San Francisco. The presidential hopeful branded U.S. border controls an 'absolute disgrace' in light of the revelation that Francisco Sanchez, 45, had already been deported five times - and was recently released from jail by officials who routinely refuse requests to hand over illegal immigrants. Sanchez is accused of gunning down Kathryn Steinle, 32, as she walked along Pier 14 with her father on Thursday evening. According to the victim's family, the attack was entirely at random.Kathryn Steinle, 32, was shot to death in broad daylight by alleged shooter Francisco Sanchez in front of her dad and a friendSanchez, 45, is a 7-time felon who should have been handed over to immigration authorities following a Bay Area arrest four months agoWould-be Republican nominee posted on Twitter to call for tough bordersDoubled down on rhetoric against Mexicans, whom he has termed 'rapists'Sanchez should have been handed over to immigration officials when last jailed, but was let go in line with San Francisco's 'sanctuary city' policy
Solution:
But _ officials admitted that due to a soft policy on undocumented immigrants, they do not always comply with the requests - which in Sanchez's case left him out on the streets on the night of the murder.