The man over there _________ be over fifty. He looks so young.

 —“Crash diets” make us lose weight fast and I am all into that. —But it_______better to work out.　   

—Are you in a hurry?—No, I’ve got plenty of time. I _______ wait.

 —Tom can’t find his gloves. Are these blue gloves his?      —No, they ______ be his. His gloves are black. 

“Mary looks hot and dry.” “So _____ you if you had so high a fever.”