He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

——Dad, must I finish my homework today?------No, you         . You may do it tomorrow.

If you spend the spring sneezing, take a look at your plate. Some foods _____ make allergies worse.

 –What will the weather be like tomorrow? –It____ be rainy, cloudy or sunny. Who knows?

--The man in a black suit _______ be our youth worker. -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.