Two automobile enthusiasts look at a 2009 Chevrolet Corvette ZR1, the most expensive and fastest Corvette ever made, at an antique car show which featured cars from General Motors past, present, and future, at the Sport Chevrolet dealership in Silver Spring, Maryland May 31, 2009. General Motors Corp. finished a key piece of business Sunday before a bankruptcy filing planned for June 1, 2009 as the deadline expired for bondholders to accept an exchange offer brokered by the Obama administration. A bankruptcy filing by GM would rank as the third-largest bankruptcy in US history and the largest and most complex manufacturing bankruptcy ever.[Xinhua]