In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

[Q]: Sentence1: Tucker has always been lazy when it comes to chores. Sentence2: He now lives alone after a great 18 years living with his parents. Sentence3: In his college dorm, he would cook food but rarely ever do the dishes. Sentence4: After being gone for the weekend, his roommate returns to a smell. Sentence5: Tucker was scolded by his roommate for the dirty dishes in the sink.
[A]: Tucker, Parents, Roommate

[Q]: Sentence1: Marcus was playing his guitar at school. Sentence2: His friend Matthew approached him and asked about the music. Sentence3: Soon they were in a heated conversation about their music tastes. Sentence4: The duo decided that they should collaborate on some music. Sentence5: The resulting album was very popular with all of their friends.
[A]: Marcus, Their friends, Matthew

[Q]: Sentence1: My science class took a field trip to the bio park today. Sentence2: Only about half of the students were allowed to go on the trip. Sentence3: My best friend Mark got left behind because he failed a math test. Sentence4: That doesn't seem fair to me because he is really good at science. Sentence5: I don't understand why teachers punish students who really try hard.
[A]:
Students, I (myself), Teachers, Mark