Misc: What four letters are put at the end of an invitation if a reply is needed?

Questions

50's Chart Toppers: Name The Artist: (Bazoom) I Need Your Lovin'?

50's Chart Toppers: Name The Artist: (My Baby Don't Love Me) No More?

50's Chart Toppers: Name The Artist: (There's No Place Like) Home for the Holidays?

50's Chart Toppers: Name The Artist: Always You?

50's Chart Toppers: Name The Artist: Am I a Toy or a Treasure??