Champagne Stakes (gr. I) winner Officer put in his final workout for Saturday's Bessemer Trust Breeders' Cup Juvenile (gr. I) when he worked Monday at Santa Anita under exercise rider Dana Barnes. Aired live as part of the TVG Network's "The Works" show, Officer changed leads at the top of the stretch as he went five furlongs in :59 1/5. Meanwhile, on the other side of the country, some of Officer's rivals in the Juvenile were among the 20 Breeders' Cup horses working at Belmont Park. Among the 2-year-olds working were two from Godolphin Racing's United States division-- Essence of Dubai and Ibn Al Haitham. Essence of Dubai was timed in 1:02 2/5 for five furlongs and Ibn Al Haitham went the same distance in 1:00 2/5. Jump Start, trainer D. Wayne Lukas' Juvenile runner, was timed in 1:00 1/5 for five furlongs and galloped out six furlongs in 1:13 3/5. Other Juvenile workers at Belmont Park were Siphonic , who got six furlongs in 1:12 4/5 with jockey Jerry Bailey aboard, and It'sallinthechase, who was timed in :47 3/5 for four furlongs. At Churchill Downs, Ken McPeek-trained Repent worked a half-mile in :46 2/5.