In a small bowl, mix together the soy sauce and broth. Heat oil until hot in a wok. Add the ginger and garlic and stir-fry for 2 minutes. Add the broccoli and carrots, bol choy, and continue to stir-fry for 5 minutes over medium heat. Add the celery and stir-fry for 5 minutes, then add the peas, sprouts and mushrooms for another 1 minute. Add the rice and and beaten egg, continue to stir-fry until the rice is thoroughly heated.