In a large skillet, mix the ground beef with the sausage, and cook until brown.

Stir in the onions and the bell peppers, and continue cooking, until vegetables are

tender. Add the tomato sauce, the diced tomatoes. Simmer twenty minutes over low

heat. Remove from heat and stir in the Parmesan cheese. Meanwhile cook pasta

shells according to package direction, drain. Arrange pasta shells in the botton of

baking pan and stuff each with the meat sauce. Pour the remaining sauce around

the shells. Place in oven and bake at 350 F for 20 minutes. Spinkle Mozzarella cheese

on top and bake until cheese is melted. Sprinkle with black olives and grated Parmesan

cheese.