我们将在48小时内确认收到您的文件。

We will ___acknowledge receipt of your documents within 48 hours.

请签署随附的表格以确认收到此包裹。

Please ___acknowledge receipt of this package by signing the attached form.

公司被要求在五个工作日内以书面形式确认收到所有投诉。

The company is required to ___acknowledge all complaints in writing within five working days.