一緒に => together N5
せいにする => Blame... N2
Cause, reason
せいか => perhaps because ~ N2
…からか/…せいか/…のか => perhaps because ~. N3
Cause, reason
させてあげる => (Allow) N4
Allow
てみせる => I'll show you ~ N4
Purpose, target
姿を見せる => figure; appearance N3
Ability
一度に => all at once N3
せいで/せいか => Because of A, B N3
Reason, Result, Response
させてくれる => Let me... N4
Allow
させてください/させてもらえますか/させてもらえませんか => please let me do N3
一通り => Basically, (get) over, done N2
Base, base