Final answer:
Refills are typically offered when the glass is partially empty or not completely full.
Step-by-step explanation:
In the context of physics, the term 'glass' often refers to a container or a drinking glass. In this question, the student is asking about offering non-alcoholic refills when the glass is ______ full. The blank space represents the level of fullness at which the refill is offered. The answer to this question would depend on the specific establishment's policy, but typically, refills are offered when the glass is partially empty or not completely full.