Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

Which modern city did Hebei or no make that Khanbaliq become?
What modern city did Khanbaliq become?

What social problems no what nationality aren't researchers Richard G. Wilkinson and Kate Pickett?
What nationality aren't researchers Richard G. Wilkinson and Kate Pickett?

How much did it cost to build Cambridge stadium or no make that Harvard Stadium?

How much did it cost to build Harvard Stadium?