Possible Clues:

• ''There ___ to be a law!''
• "You ___ to Be in Pictures" (1940 Porky Pig short)
• Should, with ''to''
• Should nothing come of this? Yes
• Anything that's repulsive found in Scripture
• "You __ to know better"
• Should prove uncommonly tough
• This should get round the thug
• This should follow the South in the looked-for way
• Is expected (to)