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

How many professors oh um students did Charles William Eliot teach throughout his tenure at Harvard?
How many students did Charles William Eliot teach throughout his tenure at Harvard?

What can an old, ill man do or rather not do?
What can and old, ill man not do?

How did no make that where did Kublai extend the Grand Canal to?
Where did Kublai extend the Grand Canal to?