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Dear Bob，

I am exceedingly glad to recall to the past time,when I studied in Canada and stayed in your home.However,today,I am writing to make an apology,since I found a CD in my luggage that I forgot to return to you.

It was your warm-hearted help that enable me to enjoyed a fruitful and comfortable trip of study.Thus ,I  am quit grateful for your help.Anyway,I,compared with your consideration ,am too careless and I totally forgot to return to it.

So,it is advisable for me to send it to you by EMS.Of course,provided that you can think of any better solution,please feel free to inform me. Once again,I am sorry for any inconvenience caused.

Your sincerely

LiMing