一緒に => together N5
(の中)で~が一番~です => out of this group, [A] is best N5
一度に => all at once N3
一口に…といっても => Although in general... N2
Evaluate
一通り => Basically, (get) over, done N2
Base, base
~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
一方だ => more and more; continue to ~ N2
... ないものは ...ない => is not entirely impossible N3
Ability
一応 => more or less; pretty much; roughly; tentatively ~ N2
一体 => …the heck; …in the world; …on earth N3
…の…ないの => thinking whether or not to do something... N2
Position, perspective
たものではない => Impossible N2
Evaluate