18 types of people one should be alert to in his life 50 kinds of people one should shun in his life 10 persons one should depend on in his life 5 types of people who can ruin your life The 50 errors one should elude in his life 100 etiquette details one should know in his life 并列题名：10 persons one should depend on in his life 并列题名：5 types of people who can ruin your life