请您根据下面提示和要求，用英语给父母写一封：

　　before you went to the united states, you promised your parents that you would write once a week, yet since then, you have failed to keep your promise. write a letter to them explaining why it has been impossible for you to write more often . do not write more than 100 words.

　　hints： you have been too busy since you arrived there.

　　the post office is rather far away from your schoolyard.

　　you have not got any achievements that you can write to tell them.

　　you promise that from now on you can write to them more often .

　　your name： chou feng（周锋）

　　your address： 316 evergreen st. freedom city, ohio, u. s. a.

　　the date of your letter： july 2, 1989

    经典范文：

　　a letter to parents

　　316 evergreen st.

　　freedom city, ohio

　　u. s. a.

　　july 2, 1989

　　dear parents,

　　it has been so long since i left home and came to the united states. everything is getting on well with me. how about you? i promised to write to you once a week when i left home. but my busy study prevented me from doing so. please forgive me for not being able to keep my promise.

　　in fact, i have been very busy since i came to the u. s. , and i even have no important news to tell you,for i have no remarkable achievements up to now. what's more, the post office is rather far away from here. i hope you will forgive me.

　　i will write to you again soon

　　yours loving son,

　　chou feng

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