逆に => conversely; on the contrary ~ N2
まさか...とはおもわなかった => never thought that N3
Surprised
まさに => exactly, surely, certainly N2
Confirm
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
いまさらながら => Still ... now N3
Time
さっぱり…ない => nothing/ absolutely not… N2
Position, perspective
いっさいない => Not at all N2
Emphasize negative meaning
いまさらのように => Now... again... N2
Time
てしまった => to finish N4
Description
させて[頂「いただ」]きます/させてもらいます => Allow me to A N1
Miscellaneous
まさか... => There's no way; that's impossible; you must be joking N3
Exclamatory
まさか => there's no way; that's impossible; you must be joking N3