Possible Clues:

• 'Either she goes -- go'
• '... -- quit!' (ultimatum ender)
• "Either you do it, __ will!"
• 'It must be him, -- shall die'
• "Wish you were here—__ were there"
• 'Either you do it ___ will!'
• Classic rock song in 'Easy Rider'
• '... ___ go!'
• Gin opening?
• '___ shall live your epitaph to make': Shak