The book ________ be Tom’s. Look! His name is on it.

Oh, I’m not feeling well in the stomach. I ______ so much fried chicken just now.

The door _____ open, no matter how hard she pushes.

---Listen! Is Kate playing the piano in the room? ---No. It _________ be her. She has gone to London with her parents.

My _______ name is Guo Ping. We are in the same school.