question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

root / base, foundation

perseverance, patience / (arithmetic) root

to erase, clear

to erase, clear

on earth, the heck, in the world (emphasized form of 一体)

totalitarianism / wholism

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)