1. First of all, teachers can thank the children for their sharing and generosity. This can be a simple oral expression, such as "Thank you for sharing, I'm glad you can share your delicious food with me."

Then teachers can further encourage children's sharing behavior and let them know that this behavior is worthy of appreciation and encouragement. For example, the teacher can say, "I appreciate your sharing behavior, which shows that you are a generous and friendly person."

Secondly, teachers can give back to children's sharing appropriately, such as sharing some of their own food or giving them small gifts, which can make children feel more respected and rewarded.

Finally, teachers can take this opportunity to further establish a positive teacher-student relationship. For example, a teacher can say, "I like being with students like you because you are a generous, friendly and enthusiastic person."