请在截止时间前完成报告。

Qǐng zài jiézhǐ shíjiān qián wánchéng bàogào.

Please complete the report before the deadline.

请务必在截止日期前完成注册。

Qǐng wùbì zài jiézhǐ rìqī qián wánchéng zhùcè.

Please make sure to complete the registration before the deadline.

请在截止日期前提交申请。

Qǐng zài jiézhǐ rìqī qián tíjiāo shēnqǐng.

Please submit your application before the deadline.