Difficulty - killing from the passage is synonymous to the difficulty which means the hindrance associated with getting something done. According to the excerpt From the passage : It's killing these kids, killing here refers to the hardship and torment being faced by the student.
Antonym refers to the opposite meaning of a given word, same means something with similar or related characteristics, the opposite could be different which means the characteristics are not the same, similar or equal.
Partially means there exist a certain percentage or level of relationship or correlation, opposite could be entirely which means there is no degree of relationship no matter how small.
Tone in fiction is the attitude of the narrator or viewpoint character toward story events and other characters. In a story with first-person POV, tone can also be the narrator's attitude toward the reader. In non-fiction, tone is the writer's attitude toward subject matter and reader
