5 sentences

1. 考试在即，同学们都在加紧复习。

   kǎo​shì zài​jí, tóng​xué men dōu zài jiā​jǐn fù​xí.

   With exams imminent, the students are intensifying their revision.

   Source: Dong Chinese Dictionary

2. 工程正在加紧进行，争取下周完工。

   gōng​chéng zhèng​zài jiā​jǐn jìn​xíng, zhēng​qǔ xià zhōu wán​gōng.

   The project is being stepped up in an effort to finish by next week.

   Source: Dong Chinese Dictionary

3. 在开赛的前几天，运动员们都在加紧训练。

   zài kāi​sài de qián jǐ tiān, yùn​dòng​yuán men dōu zài jiā​jǐn xùn​liàn.

   In the days leading up to the competition, the athletes were intensifying their training.

   Source: Dong Chinese Dictionary

4. 各部门正在加紧制定明年上半年的销售计划。

   gè bù​mén zhèng​zài jiā​jǐn zhì​dìng míng​nián shàng​bàn​nián de xiāo​shòu jì​huà.

   All departments are stepping up the development of sales plans for the first half of next year.

   Source: Dong Chinese Dictionary

5. 敌军加紧了对城市的攻势。

   dí​jūn jiā​jǐn le duì chéng​shì de gōng​shì.

   The enemy intensified its offensive on the city.

   Source: Dong Chinese Dictionary