题目内容：

假如你是林涵，下面是你的美国笔友Dave的来信，请据此给Dave回信。80词左右，注意书信格式。

Dear Lin Han,

How’s it going? I’m feeling a little lonely these days, but I don’t know why. Do you sometimes feel lonely? What do you usually do when you feel lonely? Please write to me soon.

Yours,

Dave