19. [A]To interview a few job applicants.
[B]To fill a vacancy in the company.
[C] To advertise for a junior sales manager.
[D] To apply for a job in a major newspaper.
20. [A]A hard working ambitious young man.
[B]A young man good at managing his time.
[C]A college graduate with practical working experience.
[D]A young man with his own idea of what is important.
21. [A]Not clearly specified.
[B]Not likely to be met.
预览三道题各选项，由19题中的 interview, applicants, vacancy, advertise for a manager, apply for a job 等词语可以推测对话与刊登招聘广告或应聘工作有关。而20题中 hardworking, ambitious, good at managing his time, with practical working experience, with his own idea 等词语则表明对话中还涉及到对所招聘人员的要求。