Read this paragraph from a passage.
A job provides you with valuable life experience. The work environment is very different from your school environment. "I learned things from my work that I never would have learned in a classroom," is the response of many people when asked to talk about their first job. At school you probably interact only with the people you want to; in contrast, many jobs will require you to talk to strangers. You will have to answer questions with a sense of sureness. You may also be forced to deal with impatient or angry customers calmly (since the customer is "always right"). All of these things increase your self-confidence.
What is the topic sentence of this paragraph?
At school you probably interact only with the people you want to; in contrast, many jobs will require you to talk to strangers.
A job provides you with valuable life experience.
All of these things increase your self-confidence.
The work environment is very different from your school environment.