C. GRAMMAR I. Choose the correct answer. 1. The teacher asked the students, "What (is astronomy/ astronomy is)?" 2. Kelvin asked his father, "Who (did name/ named) the planets?" 3. He wanted to know why (do planets revolve/ planets revolve) around the sun. 4. "What (is the sun made of/ the sun is made of)?" asked my sister. 5. Joe asked, "Where (the spiral arms are located/ are the spiral arms located)?" 6. The reporter asked us how deep (was the water/ the water was) on Mars.