~のぼる  => To increase N2
Reach level
... おぼえはない => don't remember... N3
Position, perspective
すら/ですら => even ~ (with emphasis) N1
ですか => Isn't it? N5
だ/です => to be N5
は...です => to be N5
Describe
すら,ですら => Even A N1
(Not)only , (Not) even
ことで => about something N2
Story topic
... こととする => to decide on N2
Speculation
~ことにする      => to decide on N4
Decision
ことにする => to decide on N4
Determined, determined
のが~です => to be N4