Three fourths of the people in the country _____ farmers. But three fourths of the land ____ polluted.
---Listen! Peter is singing in the classroom! ---It _____ be him. He has gone back to his hometown.
---What are these bottles? ---Drinking water.
There was _____ woman in the room, sitting and looking at me in the dark.
John ishonest boy and good at makingairplane model.
---Listen! Helen is singing in the next room. ---It ____be her. She has gone to Beijing.