Meanwhile, in 4-quart saucepan, heat oil over medium-high heat. Add stir-fry vegetables. Cook 3 to 4 minutes, stirring frequently, until tender. Stir in mixed vegetables, tomatoes and beef broth. Heat to boiling, breaking up tomatoes with spoon as mixture cooks. Stir in pasta. Cook uncovered over medium heat 10 to 12 minutes, stirring occasionally, until vegetables and pasta are tender.