letter

我需要寄一封关于工作的信。

I need to post a ___letter about work.

我妈妈收到了一封工作邀请信。

My mum received a job offer ___letter.

请把这封信交给经理。

Please give this ___letter to the manager.

桌子上有几封来自公司的信。

There are some ___letters from the company on the desk.