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 _ .

[EX Q]: (CNN) -- X-ray data from NASA's MESSENGER probe points to high levels of magnesium and sulfur on the surface of the planet Mercury, suggesting its makeup is far different from that of other planets, scientists say. The unmanned orbiter has been beaming back data from the first planet for a year and a half. Readings from its X-ray spectrometer point to a planet whose northern volcanic plains formed through upwellings of rocks more exotic than those often found on the Earth, the Moon or Mars, said Shoshana Weider, a researcher at the Carnegie Institution of Washington. "Before this MESSENGER mission, a lot of people assumed it was very like the Moon -- it's dark, it's grey," Weider said. But while the Moon's surface formed when light materials floated to the top of an ocean of molten rock, the low level of calcium on Mercury indicates that didn't happen there.NASA probe gives insight into Mercury's formationThe surface has sulfur levels 10 times higher than Earth'sThe MESSENGER orbiter has been circling Mercury since March 2011
[EX A]: It's about 5% the size of _ and revolves around the sun every 88 days.

[EX Q]: Michael Schumacher's 15-year-old son is to follow in his father's footsteps after he signed a deal to compete in the Formula 4 series, which nurtures young talents. Mick Schumacher has been snapped up by the Netherlands' Van Amersfoort Racing team after he finished second in the world, European and German kart championships last season. His father Michael is the most successful driver in Formula One history, with seven titles, but retired from the sport after a devastating ski accident left him in a coma. Family business: Mick Schumacher, 15, has signed a deal to race for Van Amersfoort Racing in Formula 4Mick Schumacher came second last year in Germany's kart championshipsHis father Michael Schumacher won a record seven world F1 titlesFerrari hero has been in a coma since skiing accident in December 2013
[EX A]: Announced in 2013 and first run last year, Formula 4 is an open-wheeled motor racing competition designed for junior drivers as a stepping stone to _.

[EX Q]: President Barack Obama has ordered the deployment of up to 450 more U.S. troops and establishment of a new training base in Iraq's Anbar province to help rebuild Iraqi forces in preparation for a battle to retake territory lost to ISIS. The plan to expand the 3,100-strong U.S. contingent of trainers and advisers in Iraq marks an adjustment in strategy for Obama, who has faced mounting pressure to do more to blunt the momentum of insurgents. Obama decided on the new troop deployment in response to a request from Iraqi Prime Minister Haider al-Abadi, the White House said. The two leaders met on the margins of the G7 summit in Germany earlier this week.The plan to expand the 3,100-strong U.S. contingent of trainers and advisers in Iraq marks an adjustment in strategy for ObamaHe's faced mounting pressure to blunt the momentum of ISIS - especially after he admitted the other day he didn't have a 'complete' strategyCalled for the establishment of a new training base in Iraq's Anbar province to help rebuild Iraqi forces in preparation for a battle to retake territory lost
[EX A]:
on the ground will in Anbar would help _ forces devise a.