第一节：单项选择题（共10小题；每题1分，共10分）
21. Apart from on some formal such as official reception, our manager usually wears casually.
A. conditions B. cases C. occasions D. situations
22. After careful consideration, it was agreed to the project.
A. abandon B. adjust C. slide D. retire
23. It took only fifteen minutes to get there as rush hour traffic was beginning to .
A. go up B. die down C. speed up D. turn down
24. We knew nothing about the accident. It happened to our arrival.
A. junior B. previous C. senior D. accessible
25. Generally speaking. We must work hard if we are to succeed.
