(no doubts): clear, obvious, distinct / (appearing; comprehensible by sight): apparent, visible

to investigate, to look up, to look into, to study, to examine, to check up on, to look over / (music) to play, to perform (an instrument) / (music) to tune

history, provenance, origins / a person's individual history, a person's career

greatly interesting

extraordinary, unusual

emergency

very; extremely / exceedingly; tremendously

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend