The sentences that can be answered in this situation are as follows:

1. It really makes people feel very happy to hear that children are enjoying themselves! I hope they can keep this happy and satisfied state all the time.

2. Yes, it's always reassuring to see children enjoying delicious food. I hope they can always maintain this love and appreciation of life.

3. It's really a wonderful thing for children to eat happily. Thank them for their innocence and happiness, and thank them for their growth and health.