You must watch carefully everything _____ the teacher does in class.
John isn’t here right now. He ______ Mr. Black’s office. Perhaps he______ in several minutes.
It is said that the second book __________ is written by the singer hasn’t come out yet.
— Dad, would you please buy some strawberries for me? I love them.— I'd like to, but they are not _____ in winter.
So suddenly _____ the disease that the whole family were at a great loss.
— But for your timely warning, we _____ into great trouble.— Well, you know we're friends.