用所给单词的适当形式填空。

1. The girl wants to be an English________ ( teach).

2. The first class________ (start) at 7:45 am.

3. Who is ________(you) math teacher?

4. All the people are________(excite) about the good news.

5. Jack with his partner often ________(speak)English after class.

循环氢压缩机在（）转速下进行低速暖机。

A、50转/分

B、500转/分

C、2000转/分

D、8000转/分