别忘了查看邮箱，可能有你的包裹。

Don't forget to check the ___mailbox, there might be a package for you.

我的邮箱里有一封重要邮件，请帮我查看一下。

There's an important email in my ___mailbox, please check it for me.

请把信件投进邮筒里，邮递员下午会来收。

Please put your letter in the ___mail-box, the postman will collect it this afternoon.