Tone is the author's attitude toward the speech. Since we know that Dr. King was the author and presenter of the speech, this was one of inspiration, seriousness, hope, and encouraging. This is not to be confused with mood. Mood is your feelings from the text. So, while the tone may be one of hope, to say it was 'hopeful' would be a mood (if that is indeed what you are feeling when hearing it.)
The man had jumped from a plane but his parachute had failed to open. It is the unopened package.
As you can learn from "The Crucible" Rebecca nurse is a professional so, she has the power of knowledge necessary to understand medical issues. Apart from that, she has the power of communicating with relatives. She is able to deal with stressful situations and emphatize with people.
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