假如你是李华，上周在外教Mr.Jackson的口语课上使用手机被老师发现，手机被收走。请给外教写一封道歉信，
内容应包括以下要点：
1.表示歉意；2.解释上课使用手机的原因；3.提出自己的请求并适当表态。
注意：
1.可适当添加细节使文章连贯；
2.字数80左右；
Dear Mr.Jackson，
_____________
Yours sincerely，
Li Hua

【考点】提纲作文．

【答案】Dear Mr.Jackson，
I'm really sorry about my using the mobile phone in your lecture last week.Please accept my heart-felt apology for being so rude a student.
I know any word might sound a made-up excuse.But I didn't use the mobile phone for no reason.I was trying to apply to some American universities last week and that day.I got an offer and they needed my further information immediately.Therefore，I had no other choice but to try sending them a text message in class and that was exactly what I was doing when you discovered.I promise it will never happen again.But I do need my phone back to get in touch with others.Will you be kind enough to give it back to me？
Hope you can accept my apologies and understand my situation.
Yours sincerely，
Li Hua