Exercise 10 Tell whether each sentence is a compound sentence or a complex sentence. 1. As she watched the fire, the chief directed the firefighters. 2. Outside, the atmosphere was tense; all of us worried about the firefighters' safety and the Johnsons' rescue. 3. When they all walked out, most of us cheered and waved. 4. The fire looked bad to me, but the house was repaired fairly quickly.