The answer to your question would be personification
Answer:
"What he most dreaded, that I most desired. What he most loved, that I most hated. That which to him was a great evil, to be carefully shunned, was to me a great good,..."
Explanation:
This is my answer because for what his master dreaded but he desired was freedom. What his master loved and Douglass hated was having to work for this man.
I don't see the underline, but I'm pretty sure that the verb is "has known". That's the present perfect tense.
Because it prevents them from breathing, since the ant is blocking off their airway.