Fill both gaps with 'beautiful' or 'beautifully': The music sounded ____, and the choir sang ____.
- 'sounded' is a linking verb here; the word after it describes the music, a noun, so an adjective is needed.
- 'sang' is an action verb; the word after it tells how the choir sang, so an adverb is needed.
- Check: 'The music sounded beautiful, and the choir sang beautifully.'
Answer: beautiful; beautifully