Related Clues:

• Bing Crosby's 'So ___'
• Cole Porter's '-- Love You?'
• ''And how!''
• 'How -- love thee'
• '-- know you?'
• Enthusiastic affirmative
• 'How -- love thee?'
• "What ___ look like..."
• The Natl. Park Service is part of it
• Rhetorical question, possibly
• 'Where -- start?'
• "So ___"
• ''___ have to?''
• 'Where -- begin?'
• '___ make myself clear?'