In a Dutch oven, stir flour and oil until smooth. Cook over medium-low heat, stirring constantly, until mixture is a light reddish-brown, about 10-15 minutes. Stir in the onion, celery, green pepper, green onions and garlic. Cook over medium heat until the vegetables are just crisp-tender, about 5 minutes, stirring often. Stir in the broth, soup, tomatoes and seasonings; bring to a boil. Reduce heat; cover and simmer for 30 minutes. Add shrimp; cook for about 10 minutes longer or until shrimp turn pink, stirring occasionally. Discard bay leaf. Stir in parsley. Serve soup in bowls over rice. Yield: 8-10 servings (2-1/2 quarts).