根据句意及首字母提示补全单词。

1. She is only 3 years old, but she can r_____ many poems.  

2. My aunt is a n_____ in a hospital. She takes good  care of her patients.

3. Please make a d_____ with your partner.

4. At last I sat in the fourth r_____ in the classroom.

5. We are p_____ to see each other again.

6. The beautiful girl plays the leading r_____ in Beautyand Beast.

7. The best b_____ was the fight between the two families and their servants.

简述变质矿床分类及其特征。