Second-hand books, handicrafts, gourmet food, etc.

1. Second-hand books: The school flea market is a good place for students to exchange second-hand books.

Students can sell or exchange books they no longer need for books they need.

2. Handicrafts: Students can use their handicraft skills to make some small objects, such as bracelets, key chains, earrings, etc. These small objects can be sold to classmates or teachers, and are also a good opportunity to show off their talents.

3. Food: Students can make some food by themselves, such as cakes, biscuits, potato chips, etc., and sell them to classmates or teachers.