boy
boy wonder

chinless
a chinless wonder

hold
...I wonder whether he has any hold of the subject

if
I wonder if he's back

nine
nine days' wonder

prompt
I wonder what prompted him to that

round-eyed
...in round-eyed wonder

strike
to strike with wonder

who
I wonder who that girl is

why
I wonder why he didn't write to them

wonder
to be filled with wonder