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

[Q]: What is the Rhine, scratch that, where does its name come from?
[A]: Where does the name Rhine derive from? 


[Q]: When did Goldbach or wait Landau propose his four conjectural problems?
[A]: When did Landau propose his four conjectural problems?


[Q]: What have many HT groups, no, I mean members graduated to joining?
[A]:
What have many HT members graduated to joining?