何か, なにか, なんか
Pronoun
1. something, some, any
Adverb
2. somehow, for some reason
Only なにか, Interjection
3. (so) what (are you trying to say)?, what (do you mean)?
ここまでのところで何か落としていることはありませんか。
を
Particle
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action