Possible Clues:

• 'Is that ___?'
• 'Is that --?' ('Oh, really?')
• "It's __!": "True!"
• 'It's __!': 'True!'
• "Is that __?": "No kidding?"
• 'Is that __?': 'No kidding?'
• "Is that ___?" ("Really?")
• "Is that ___?" ("You don't say!")
• "Is that ___!"
• "Oh, is that ---?"