Public wi-fi should never be used when you are:

Although public wi-fi has become almost universally available, it is important to remember that it should not be used at all times. There are times when using public wi-fi can be dangerous. One of the most important dangers of using public wi-fi is the fact that the connection is not always secure. Therefore, public wi-fi should not be used when we are entering private or secret information such as credit card or bank information.

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explanation:

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in the quotation from passage, connie willis states that literature is a way for authors from the past to communicate with readers of today. we can read their stories, books, and other texts to learn lessons about life. willis refers to these lessons as messages “from beyond the grave.” willis has a favorable viewpoint about the timelessness of literature.