Definition: Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
Input: What stretched or covered Scandinavia, the Baltics, Scotland, and the Alps in the last Ice Age?

What covered Scandinavia, the Baltics, Scotland, and the Alps in the last Ice Age?