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There are 2 ways of addressing people: friendly and formal. You may address a person in a friendly way and call him by a first name only if you know the person very well. But if you are not familiar with the person or don't know him well enough use the formal way of addressing people.
Addressing a woman remember that "Miss" goes only with the name of a girl оr unmarried woman. "Mrs." is a form of address to married women only. "Ms" [miz] is used as a title of woman without distinction between married or unmarried. "Mr." is a form of address before a man's name. The polite form of addressing people is used to show respect to a person. In this case "sir" and "madam" are used.