你最好的朋友Jack最近迷上电脑，因此常常熬夜，疏忽课业，并受到父母的指责。你打算写一封信给他,适当地给予劝告。
注意：⒈词数120-150之间（开头语已为你写好，不计入总词数）；
2．可以适当增加细节，以便行文连贯；
Dear Jack,
How have you been recently?
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