Questions about example sentences with, and the definition and usage of "Staples"

A: these are staples! :) Staples is also store that sells stationary :)

A: The doctor has taken out my staples from the surgery.

I’m out of staples for my stapler.

We need to buy some staples for baking. I’d like to make some cookies.

Staples such as bread, rice and tea are already being rationed after the earthquake.

Bread, potatoes and other staples continue to rise in price.