Which way would a native say thse 3 sentences?

Could you please tell me which way you'd say these please?

1. What episode are you on/at? (you are watching an episode on tv and your friend wants to know which one)

2. Would you rather see her live or him?/Would you rather she lived or he did?

3. She's the person who most believes in me./who believes in me most.

Thank you