The hotel would be able to float under water because it would be______.

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• What would you say to the hotel receptionist to get a double room?

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• Would you be able to go to the party?（）

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• Last year, America's Defence Advanced Research Projects Agency, DARPA, thought it would be a good idea to organize a robot race across the Nevada desert. The idea of the Grand Challenge, as DARPA dubbed it, was for autonomous robot vehicles to steer a 227 km(142 mile) course and claim a $1 m jackpot. This would be a first step towards DARPA's ultimate goal of being able to build unmanned self-driving military vehicles and thus keep American troops out of harm's way on the battlefield.

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• -- Would you be able to come to the party？ -- I ___.

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