根据句意和首字母提成下面的单词。

1. English is the language of international b     _.

2. Many people learn English so they can have more s     _ in business.

3.  Sometimes, business English is h     _ to understand.

4. If you join our c     _, you'll learn all the business lingo you need.

5. My aunt always feels weak and tired,because she is too f     _.

6. Lei Feng always helped others,and he gave us a good e     _.

7. Because he is a b     _,he doesn't know how to do it.

8. Please pay for courses by c       . Don't mail cash.

9. If you work hard,you'll pass the f     _ exam.

10. If you pass the exam,you'll get a c     _.