         Sentence. 1: Government workers’ froppedl in. a  burning downtown office tower frantically diated 91  os. they tried.to make their way: through smoke-filled  staircases and hallways , officials said    Seritence 2: Some people trapped in'a burning: high-  rise building. in ‘Chicago -'s Loop “business district,  frantically dialed’ 911 for help in escaping’ the smoke~  filled staircases and hallwéys . officials said.