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.

Europe first colonized the Americas, then Asia, but what continent was fourth umm I mean third?
Europe first colonized the Americas, then Asia, but what continent was third?

What period er how did the Rhine extend watershed southward?
How did the Rhine extend watershed southward?

What was er what did the the Europeans think the peoples in the tropics were in need of?

What did the the Europeans think the peoples in the tropics were in need of?

