TASK 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.
PROBLEM: What lens do petrologists use no just what lens it is that is used to identify chemical composition?

SOLUTION: What lens is used to identify chemical composition?

PROBLEM: What do or what is structural geology?

SOLUTION: What is structural geology?

PROBLEM: What city later became Khanbaliq no Beijing?

SOLUTION:
What city later became Beijing?