For capital letters, we can just add the ending -s, for example:
I got As in the final exam.
for lower-case letters, an apostrophe is used to avoid confusion:
In the multiple-choice exam all the correct answers happened to be a's! (as in: option a)
Answer:
"Wisely and slow, they that run fast stumble."
Explanation:
By him saying these words, he is reminding Romeo to be careful of his rashness and all-consuming love.
An art song is usually for solo voice and is accompanied by solo piano. (Just as a side note, I recommend listening to the Erlking by Schubert if you have time; it's a German art song (lied))
An antagonist wants to defeat the protagonist in whatever conflict there is between them. they are the "villain" in the story.