If you are looking for something other than they or a word that isn't possessive, then try to use words like most say, many, them, a majority, it's been proven, or authority figures think/say.
just use any of these and see if it works.
Your welcome!
Instead of using the word challenging you can use the word gifted, special, special gifted.
or
Will, when, why, it, can
Myself
I have a stomach ache.
mixture
are
used to be
is, it, in the past.
no "It" is not used instead of he and she...
Answer.
Use the word "how" when asking "in what manner". Use the word "why" when asking "for what reason".