singing
                    - Is Lily good at singing? —Yes , she is.We often hear her_______ in the next room.
 - Listen! Tom is singing in the next room.–It _______ be Tom. He has gone to Shanghai.
 - Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.
 - Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.
 - I _____ singing to dancing.
 - Listen! Marry is singing in the next room. — It __ ___ be Marry. She has gone home.
 - Listen! Helen is singing in the classroom.—It _______ be Helen. She has gone to Shanghai.
 - Listen! Is that Millie singing?—No. It _____ be Millie. She has gone to Beijing.
 - Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for an important meeting.
 - Listen! Is that Linda singing in the next room?— No, it ________ be her. She is still in Shanghai.