你记得把那封信邮寄给我吗？

Did you remember to ___mail me that letter?

请在表格上签名，并将其邮寄到下面的地址。

Please sign the form and ___mail it to the address below.

我得去邮局邮寄这个包裹。

I have to get to the post office and ___mail this package.