Are all the underlined words I have used correct and acceptable?

Are all the underlined words I have used correct and acceptable?

1. Carla spoke with a melodious, well-modulated voice, which is essential in communicating with students & in building rapport with them.
2. The new teacher was alert enough to call the attention of two latecomers, whom she asked to introduce themselves and tell about their expectations of her.
3. Daisy wore a smile that could easily catch everyone’s attention.
4. Smith instructed three students to share their insights one by one on his motivational question “What particular things around you are you most curious about?”