I had this as a listening exercise. The voice clearly says 'velká', but only 'veliká' is accepted.
You are right, I can clearly hear "velká" and "sedum" (which is an acceptable pronunciation for "sedm", but might be confusing here).
turning off the listening exercise.
Plenty big? Really?
You eat goose?
You don't in France? It's not common anymore (I'm not even sure I've ever eaten it in my whole life), but it used to be an important part of feasts in the olden times, and you can still order it in some more traditional restaurants.