A mercadillo is a street market so you can buy all kinds of things there. So I would say:
At a mercadillo you can buy clothing, Spanish street foods, and meal ingredients such as spices, fruits, and vegetables. A mercadillo refers to a traditional market that is usually held on the weekends that’s in a commonly spotted area with Spanish/ Hispanic/Latin culture.
Hope this helps!
Ana y yo corremos is correct
1. Tú tienes unos amigos muy interesantes.
2. Yo vengo del centro comercial en autobús .
3. Ellos no tienen suficiente dinero.
4. Todos los sábados yo voy al cine.