Possible Clues:

• "Now ___ seen it all!"
• "Now __ seen everything!"
• '___ Had It' (1959 hit)
• ''__ been thinking . . .''
• '___ Got the World on a String'
• ''___ Got You Under My Skin''
• '___ been thinking . . .'
• "If ___ told you once . . ."
• "__ seen enough!"
• 'So ___ heard'