Rose, you       leave your school things on the floor like this. Keep your room clean and tidy.

The lady in the sitting room           be over sixty. She looks so young.

 -- Is it your brother playing football outside? -- It ________ be him. He is helping mother with dishes now.

--Listen! Tom is singing in the next room.--It _______ be Tom. He has gone to Shanghai. 

---Is John coming by train?    ---He should, but he ________ not. He likes driving his car.