Question

2. Even though Kenny was a great roommate, John hated ________ in the shower.

Answer 1

her in the shower


heya mate

Answer 2

Heya...!!!

HERE IS YOUR ANSWER

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The suitable preposition for this sentence is HER.

Even though Kenny was a great roommate, John hated her in the shower.

We used 'her' here as Kenny refers to a girl.
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HOPE IT HELPS!!!