Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
--------
Question: Which modern city did Hebei or no make that Khanbaliq become?

Answer: What modern city did Khanbaliq become?


Question: Which two er who had no influence in promoting the use of chemical compounds as medicines?

Answer: Who had no influence in promoting the use of chemical compounds as medicines?


Question: Which characteristics I mean in which countries can you find the least health and social problems?

Answer:
Where are health and social problems least common?