Possible Clues:

• 'Zounds!'
• 'Heavens to Betsy!'
• 'Gadzooks!'
• 'Holy moly!'
• Words to invoke the old divinities in the theatre?
• Express approval and leave daughter inside? I'm astonished
• 'Holy cannoli!'
• “Great Scott!”
• Oath invoked by Pope
• Archaic 'Yikes!'