According to Mercutio, the dreams granted by Queen Mab reflect the desires of the individual. Therefore, Queen Mab would make a doctor dream of performing a successful surgery and saving a life because that’s what doctors want to do.
Nunez is a mountaineer who falls down a mountain and ends up in a valley where the "Country of the Blind" is.
It is important because if their names were on the ration books, they would have been found out by the Nazis and taken away, like all of the other Jews.
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Impromptu is an unrehearsed speech. Not rehearsing would not allow speakers to gather 100% of their thoughts.
The question of how to practice morality and doing the right things falls under the category of ethics.