singing
                    - Listen ! Helen is singing in the next room.—It __________ be Helen. She is in Tianjin now.
 - A: Listen! Is it Tina singing in the next room?B: No, it __________ be her. She is still in Shanghai.
 - Listen! Is it Linda singing in the next room? –No, it __________ be her. She is still in Shanghai.
 - A: Listen! Is it Linda singing in the next room? B: No, it __________ be her. She is still in Shanghai.
 - The shy girl prefers _____ in the KTV to _____ on the stage.
 - Have you ever seen the singing star we love very much?[ ]
 - Do you like-singing? Please come and join .
 - Do you like-singing? Please come and join .