课后小作业，巩固一下这节课堂学到的小知识吧！
请更改下文中的部分用语，使整个信件更加礼貌和严谨。（答案会在一周内发送至您的邮箱中）
Dear Mr
Harris Nice to speak to you earlier on the phone. I'am now sending you a draft contract. Please read it carefully and if you’re OK with the terms, sign it and post it back to me. The deadline for he special offer we talked about is supposed to be tomorrow, but we’ll keep it open for you until the end of the week. Do call me if you have any queries. Best wishes Laura