单词拼写。

1. The two o______ languages in Canada are French and English.

2. She has a very large v______ and she can read English novels now.

3. Her health is g ______ improving.

4. His n______ language is not Chinese but he can speak it fluently.

5. He spoke for an hour but didn't a______ say anything important.

6. The police are still uncertain of the murderer's ______ (身份).

7. A lot of practice helped the spokesman to become a more ______ (流利的) speaker.

电压互感器按原理分为（）和（）两类。