Possible Clues:

• "Don't you agree?"
• ''Don't you agree?''
• "So true, right?"
• "Wouldn't you agree?"
• ''So true, right?''
• Question of confirmation
• 'Right?'
• The much-quoted closing line of Hemingway's The Sun Also Rises (4,2,6,2,5,2)
• 'So true, huh?'
• 'Don't you agree?'