根据下面句子的意思及所给的汉语提示，写出空缺处单词的正确形式。
1. How beautifully she sings! I've never heard a better _____ (嗓音).
2. She is ________ (结婚的), so we can call her Mrs. Smith.
3. We are in the same class. We are ________ (同班同学).
4. Will you ________ (邀请) some friends for dinner?
5. Don't be ________ (紧张的). It's very easy.
6. She likes singing. She wants to be a ________ (歌手).
7. Every teacher has a _________ (不同的) classroom.
8. She lives here with her ________ (父母亲).
9. Mary likes playing ________ (钢琴) very much.