阅读下面的短文，用括号中所给动词的适当形式填空，必要时可加助动词。
You may know the song Happy Birthday very well. But do you know about its writer? It was written by an
American girl. And now she 1. (become) a very rich woman.
When she was a child，she was poor. Once she 2. (invite) to her friends' birthday party. She was
very pleased but sad because she had not enough money to buy presents for them. "The party 3. (come)
soon. Now I have little money." Tears ran down her face.
Later that night she was in bed, thinking about the presents when the door opened and in came her grandma,
"What 4. (happen)?" her grandma asked. Hearing the girl's story, she said, "5. (not worry), I
think I 6. (help) you. How about singing a song together? Happy birthday to…" What a beautiful song!
They sang and sang. Suddenly she woke up. It was a dream! She decided to write it down at once and 7.
(sing) it to her friends at the party.
When she sang the song at the party the next day, her little friends were very happy. "How wonderfully she
8. (sing)! We 9. (not hear) such a song before. Thank you for 10. (give) us the special
present." said one of them. And they learnt to sing it together. Later the girl became well known in America.