Here are the answers based on your questions:
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The right of artists to use speech, art, or other means to communicate opinions without restraint is best described as freedom of speech.
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A visitor who quickly views the work and is gone within five minutes is an example of a passive observer.
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A visitor who spends time sketching a few pieces and asks questions to the exhibiting artist is an example of an active observer.
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The comment that is the best example of an unbiased opinion is “This artist pays close attention to capturing the shadows on the subject’s face.”