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Nowadays, most of people prefer to use
smart phones. Please raise your hand if you like smart phones? As you can see
why all of you prefer to use smart phones. Smart phones can keep a lot of
programs that can attract people. Some people spend much time a day to use
smart phones for checking Facebook, Instagram, playing game, video conference,
take photo, especially selfie and so on. Do you know how to control yourself
for not using smart phones many times a day?