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].

Example Input: Trains crossing snowfields, winding through meadows, passing by mountains, by day and night, through winter and summer. These stunning images are the work of one photographer in his quest to capture the incredible beauty of China's railway lines. Wang Wei, 25, has travelled more than 185,000 miles over the past 10 years and taken more than 300,000 photographs across the country, reported the People's Daily Online. Now, some of the photographs will feature in a new book called Running After Trains, to be published in July. The freelance photographer tells MailOnline his new book will focus on the photography techniques for shooting trains, and he hopes his photos can show the beauty of Chinese railways to more people.Wang Wei, 25, has travelled more than 185,000 miles over past 10 years and taken more than 300,000 photographsHis obsession with trains began aged 11 when he stole his parents' camera and went down to the railway trackHe spends five months travelling every year, and has been everywhere from Gobi desert to the Russian borderSome of the photographs will feature in Wang's new book Running After Trains, due to be published in JulyChina's vast railway network is 75,000 miles long - the second largest in the world behind the United States 
 Question:'The authorities don't promote _ trains and railways often enough, but they are so beautiful and they belong to every one in China,' says Wang.
Example Output: China

Example Input: (CNN) Your "BPA-free" plastic product may be no safer than the product it replaced, says a new UCLA study that analyzed the impact of a common BPA alternative on zebra fish embryos. The study joins a small but growing group of similar research sounding the alarm about so called "BPA-free" alternatives. "Our findings are frightening and important," said senior author and reproductive endocrinologist Nancy Wayne. "Consider it the aquatic version of the canary in the coal mine." After decades of animal research linked BPA (Bisphenol A), a known endocrine disruptor, to problems with brain and reproductive development, early puberty and a rise in breast and prostate cancer, many manufacturers stopped using the chemical to harden plastics, replacing it with "BPA-free" alternatives. The most common replacement is BPS (Bisphenol S), said Wayne.BPA-free alternatives may be no safer than BPA, say researchersMost common alternative, BPS, linked in study to disruptions of estrogen and thyroid hormones 
 Question:In addition to the effect on estrogen, the study also found both _ and BPS affected the thyroid hormone system.
Example Output: BPA

Example Input: Gareth Southgate wants his players to show England teams can entertain and win with style as their preparations for Euro 2015 intensify. Though the senior side have not lost a game since the World Cup finals last summer, they have rarely provided football to quicken the pulse in the time since and never was that more apparent than in the charmless 0-0 draw with the Republic of Ireland. The situation has been different for the Under-21s. They have thrived under Southgate’s guidance and their ability to play with fluency and class was shown when they put together a 35-pass move that ended with James Ward-Prowse scoring the decisive goal in a 3-2 win over Germany in March.England Under 21's are continuing their preparations for this summer's European Championship in the Czech RepublicGareth Southgate wants his side to win and do so in styleSouthgate has high hopes for his U21 squad this summerHarry Kane returned to training following a break away on Tuesday, while Danny Ings trained for the first time since signing for Liverpool 
 Question:_ will play a near full-strength side but Chelsea’s Ruben Loftus-Cheek may figure.
Example Output:
Gareth Southgate