Test your knowledge of the past week's news and current events.
Quiz: Test your news knowledge
Participants in the fourth annual 'No Trousers Tube Ride' stand on a platform and a tube train on the London Underground in London January 13, 2013. About 150 people divided into groups and took off their trousers, as part of an annual social media-driven event held in several cities worldwide. REUTERS/Suzanne Plunkett
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