The last letter of the alphabet is Z.
Mood, and tone would both fit greatly, because if the writer is in a mad mood for example, then he is not able to express something romantic in his book, or something happy. Hope that this would help you! =)
<span>I agree with A. We will never stop needing people to do basic jobs. At present, even with increased automation, there will always be a need for people to do basic jobs that machines and computers are not able to do. Mechanical Turk from Amazon is a perfect example. I think that as automation takes over certain jobs, other basic jobs will become available. After all, if everyone was a doctor or something, there would be no one around to build houses. Suddenly the house builders would be hot commodities and would start making more money than doctors because of their increased demand.</span>