Subordinate.
"Once you finish your work" by itself is not a sentence, therefore it depends on the remaining.
I don't see the underline, but I'm pretty sure that the verb is "has known". That's the present perfect tense.
Answer:
<em>The author expands his argument of reading and its importance in the lives of children</em>.
Explanation:
"I Am Very Real" was written by Kurt Vonnegut. He was an American native. He had a writing career of about fifty years. He died on 11th April 2007. This letter was published in 1967. In it, he describes how rights come with responsibility and it is not necessary for a person to fulfill each and every right of another individual.
He also wrote this letter to make the receiver aware that writers are real people, not just fake names. He talks about children and how to prepare them for practical life through books.
I would say that the best answer would be the last one.
