helen
                    - Helen has no friends _______.
 - Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.
 - Helen often ______ a lot of time listening to music.
 - Listen! Helen is singing in the classroom.—It _______ be Helen. She has gone to Shanghai.
 - Where did Helen go on vacation ? — She New York City.
 - I __________a brother and Helen ______ a sister.
 - Listen ! Helen is singing in the next room.—It __________ be Helen. She is in Tianjin now.
 - Helen ______ books at the moment.
 - While Helen __________ the guitar, her mother came in.
 - Helen is a thoughtful girl. — Yes. I think she is _____ plan everything well.