Is the question below a fragment, run-on, or correct?

although mary has been my best friend.

When gatsby was in europe after world war i and circumstances forced daisy and him to face unpleasant realities about their relationship,

Iwanna listen to music but i have a migraine. are there any songs that would be good for me to listen to that wont make the migraine worse

Those are books that need to be returned to the library what is the antecedent of the pronoun those