---______ he have been chosen as captain of our school football team? ---Yes, he______. Can’t you see he’s wearing an armband?

—Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.

--Is the man standing outside the teacher’s office Mr. Zhou?  --No, it ______ be him. He has gone to Hong Kong for an academic conference. 

Please do not feed the fish; they _____ die if they eat too much.

----Whose book is this?----It _______ our geography teacher’s. You see, his name is on it.