I think smart phones are the most important technology in my life. Smart phones benefit people because they help people to spend their time usefully. Also, people can play games to use smart phone without money. However, a disadvantage of smart phones is a daily fee because fee is an expensive. Despite this disadvantage, smart phones have a lot of advantages.
Great paragraph. I am glad you are thinking about good and bad aspects of cell phones. That is important for writing opinion essays.
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