German homework help, please? Wer, was, oder wen?

Today, our German teacher tried to explain to us when you'd use wer (who), was, or wen (whom) in sentences. Frankly, to me it made very little sense. These are the problems: ___ kommt um halb fünf? Peter und Angelika. ___ kennt er? Frau Meier. ___ hörst du? Klassische Musik. ___ hat Hausaufgaben?... show more Today, our German teacher tried to explain to us when you'd use wer (who), was, or wen (whom) in sentences. Frankly, to me it made very little sense. These are the problems:
___ kommt um halb fünf? Peter und Angelika.
___ kennt er? Frau Meier.
___ hörst du? Klassische Musik.
___ hat Hausaufgaben? Alle.

Thank you for your help, I'm confused on this topic. :/
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