Omg i remember reading this story! A fav!
Ok so:
Four sound are
planes bombing (unpleasant)
Marching of the nazis (unpleasant)
Children playing (pleasant)
Music? I forgot what the instrument was but they heard an instrument (pleasant)
Strange and exotic.
If there is an adjective after the noun, its predicate adjective.
Answer:
(SLOW)
Explanation:
I usually go very (SLOW) on my skateboard