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].
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Question: San Francisco (CNN) -- As Nokia prepares for its next crucial venture into the U.S. and high-end smartphones, the Finnish cell-phone maker is missing a crucial piece: an abundant catalog of applications. Nokia is attempting to woo app developers with such incentives as pre-installing their software on the forthcoming phone, prominent promotion for their products and funding development of an app, according to three people involved in the negotiations. A vibrant app store has become a major selling point to smartphone customers. In the past, Nokia, which sells the highest volume of mobile phones worldwide, has made efforts to work with some creators of apps for its platforms. A Nokia spokeswoman said the company offers app developers a variety of incentives, some in partnership with Microsoft, which include coding assistance and marketing. "We do not disclose these arrangements, as each is different," she said. Microsoft declined to comment for this story.Nokia is offering to pay developers to make apps for its new phone, sources saySuch payments from phone manufacturers are unusualMicrosoft did something similar last year, but its Windows Phone app catalog is still lackingNokia is set to launch its first Windows phone by the end of the year, sources say 
 Question:On Tuesday, Microsoft began distributing the new version of Windows Phone, which will run on the _ device.

Answer: Nokia


Question: 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.

Answer: China


Question: Rio Ferdinand believes Louis van Gaal's decision to return Wayne Rooney to his favoured attacking role has led to the Manchester United's upturn in performance levels. Writing in his column in The Sun ahead of the Manchester derby on Sunday, Ferdinand, now at Queens Park Rangers, revealed his belief that Rooney playing as a striker is fundamental to United hitting fifth gear. He praised Van Gaal for moving his captain further up the field after a spell in the centre of the pitch at the start of the year but admitted the return to form and fitness of Ander Herrera, Marouane Fellaini and Michael Carrick has also been important.Rio Ferdinand says Manchester United need Wayne Rooney in attackHe believes Rooney's form has been key to their upturn in performancesFerdinand said United's 2-1 win at Anfield shows they are 'on to something'Manchester United vs Manchester United: The expert view of the derbyCLICK HERE for all the latest Manchester United news 
 Question:Ferdinand also pointed to the return of midfield player Michael Carrick (left) as a help to _.

Answer:
Manchester United