Question

alloy, ceramic, polymer; there is a picture of a french horn and a picture of a notebook, each with a blank box next to them for classification.

Explanation:

For the French horn (top image), it is typically made of an alloy (like brass, which is an alloy of copper and zinc). For the notebook (bottom image), the paper is made from polymers (cellulose is a polymer, and notebook covers or binding might also involve polymers) or the notebook's components (like the cover if plastic) are polymer - based. So the French horn should be categorized under alloy, and the notebook under polymer.

Answer:

Top box: alloy
Bottom box: polymer