に気がつく => to notice; to realize N4
さすがに => understandably N2
Base, base
おくに => Which country N5
Doubt
に...ができる => complete N4
Completed
~にもなく => ~different from N1
Compare
~になく => different from usual N1
Exception
にくい => difficult to do ~ N4
にしてからが => Even... N1
Demonstrate by example
とかく…がちだ => apt to do, tend to do N2
Trend
~んがため(に)/~んがための      => in order to ~ N1
~かいもなく/~がいもなく      => despite; even though ~. I tried hard / hard but unfortunately ~ N1
~く/ ~にする      => to make something ~ N4
Add meaning