假如你是李华。校英文报Growing pains栏目专门解答中学生的烦恼问题。现栏目收到一封来信。请根据这封信的内容写一封回信。
Dear Editor,
I am really angry with my parents recently. Next Sunday is my birthday. My parents promised to buy a cell phone for me as my birthday present this year. But now when I ask about the birthday present they say they have changed their ideas, because they worry about my study if I get a new cell phone since the final exam is coming soon. They say a cell phone may take up too much of my time. I believe I am old enough to control myself, but they don't believe me. What's more, they broke their promise!
Li Yan
内容要求：
1）理解父母良苦用心；
2）手机有利有弊；
3）给出你的建议。
注意：1）词数100左右；
2）可适当增加细节，以使行文连贯；
3）开头和结尾已写好。
Dear Li Yan,
It's normal to have these feelings.
……
I hope things will be better for you soon!
Yours,
Li Hua
是虚数单位，使
为实数的最小正整数
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