Agence France-Presse: In a sign Monday of growing desperation, BP contemplated plugging a gushing oil leak in the Gulf of Mexico with golf balls, tires and debris in a high-risk maneuver called a "junk shot." The British energy giant said its clean-up costs had reached 350 million dollars since the Deepwater Horizon rig sank 50 miles (80 kilometers) off the Louisiana coast on April 22 following an explosion that killed 11 workers. The pressure on BP to plug the leak from a fractured pipe on the …