4 sentences

1. 总之，我们必须在截止日期前完成任务。

   zǒng​zhī, wǒ​men bì​xū zài jié​zhǐ rì​qī qián wán​chéng rèn​wu.

   In short, we must finish the task before the deadline.

   Source: Dong Chinese Dictionary

2. 为了赶上截止日期，我们必须加快速度。

   wèi​le gǎn​shàng jié​zhǐ rì​qī, wǒ​men bì​xū jiā​kuài sù​dù.

   In order to meet the deadline, we must speed up.

   Source: Dong Chinese Dictionary

3. 我们必须想方设法在截止日期前完成这项工作。

   wǒ​men bì​xū xiǎng​fāng​shè​fǎ zài jié​zhǐ rì​qī qián wán​chéng zhè xiàng gōng​zuò.

   We must find ways to complete this work before the deadline.

   Source: Dong Chinese Dictionary

4. 为了在截止日期前完成任务，他夜以继日地工作。

   wèi​le zài jié​zhǐ rì​qī qián wán​chéng rèn​wu, tā yè​yǐ​jì​rì de gōng​zuò.

   He worked day and night to finish the task before the deadline.

   Source: Dong Chinese Dictionary