你刚刚从加拿大学习回来发现你忘了把Bob借给你的一张CD还给他写一封信向他表示歉意。信件要点包括：1表示歉意并说明理由；2建议一种解决方式；3再次致歉并请求Bob谅解。

Dear Bob,

I hope this letter finds you well. I am writing to apologize for not returning the CD you lent me before I left Canada. I am truly sorry for any inconvenience or disappointment I may have caused you.

The reason I forgot to return the CD is that I was busy preparing for my return trip and I completely forgot about it. I know this is not an excuse, and I take full responsibility for my forgetfulness.

To make things right, I would like to suggest that I mail the CD back to you as soon as possible. I will cover the shipping costs and ensure it arrives safely. Alternatively, if you prefer, I can send you the money to replace the CD.

Once again, I want to express my sincere apologies for my mistake. I value our friendship and hope you can forgive me for this lapse in memory. Thank you for your understanding and patience.

Sincerely,

[Your Name