He felt ______ as soon as he realized that he had asked a foolish question.
–Are you coming to Jeff’s party?–I’m not sure. I _____ go to the concert instead.
Sorry, I am late. I _____ have turned off the alarm clock and gone back to sleep again.
Children under 12 years of age in that country _____ be under adult supervision when is a public library.
Oh, Tom, _____ you gave us!
Look! There _____ the bus!