开头：
1 How nice to hear from you again.

2 Let me tell you something about the activity.
3 I’m glad to have received your letter of Apr. 9th.

4 I’m pleased to hear that you’re coming to China for a visit.
5 I’m writing to thank you for your help during my stay in America.
结尾：
1 With best wishes.

2 I’m looking forward to your reply.
3 I’d appreciate it if you could reply earlier.

开头：

1 多么高兴再次收到你的来信。

2 让我告诉你一些事关于活动。

3 我很高兴收到你的来信，4月9日。

4 我很高兴听到你来中国访问。

5 我在写感谢你对我在美国逗留期间的帮助。

结尾：

1 最美好的祝愿。

2 我期待着您的回复。

3 我会很感激，如果你能提前答辩。