Pronoun:
kuka, joka, kuten, mitä, että, ei mitään, nuo, jonka.
Adjective:
joka, mitä.
WHICH boy?
from her, WHICH couldn't have happened without Sheldon.
at the Stone Mill WHICH may have some bearing...
Speaking of WHICH, I have some news about your Aunt Trixie.
...WHICH then goes into their mouth.