Question: Context: Three police officers have been killed by a gunman in Pittsburgh - the second mass shooting in the US in 24 hours. The officers were responding to an emergency call from the house of the gunman, named as Richard Poplawski, 23. Police said he was waiting, armed with rifles and a bulletproof vest. He shot two officers as they entered the house, and a third who tried to help them. He then traded gunfire with police for four hours before being injured and giving himself up. His friends said he had recently lost his job, and was worried that US President Barack Obama was about to ban guns.

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Answer: Hypothesis: In Pittsburgh the police killed a gunman.

Question: Context: On the eve of a widely anticipated retaliation against Russian forces in Grozny, military commanders withdrew key units from the city, leaving it vulnerable to guerrilla infiltration.

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Answer: Hypothesis: Russian forces vulnerable to guerrilla fighters

Question: Context: Despite this, even the most enthusiastic surgeons say it is likely to be several years before they would consider leaving a robot to operate on its own.

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Answer: Hypothesis: Robots are used to assist in a range of surgical procedures.

Question: Context: The National Park Trust identified 20 high-priority sites - including the Blue Ridge Parkway in North Carolina and Virginia and Everglades National Park in Florida - as areas with private property that could be sold.

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Answer:
Hypothesis: Everglades National Park is located in Florida.