Outstanding, extraordinary, brilliant, incomparable, excellent.
noteworthy, important, of consequence, remarkable, exceptional
Exceptional, unparalleled, preeminent, unmatched, excellent...
Instead of using the word challenging you can use the word gifted, special, special gifted.
or
Will, when, why, it, can
I have a stomach ache.
Myself
mixture
are
used to be
is, it, in the past.
no "It" is not used instead of he and she...