7 sentences

1. 他在手上剌了一道口子。

   tā zài shǒu shàng lá le yī dào kǒu​zi.

   He cut a gash in his hand.

   Source: Dong Chinese Dictionary

2. 他的衣服上撕了一个口子。

   tā de yī​fu shàng sī le yī gè kǒu​zi.

   There is a tear in his clothes.

   Source: Dong Chinese Dictionary

3. 他不小心在手上拉了一道口子。

   tā bù xiǎo​xīn zài shǒu shàng lá le yī dào kǒu​zi.

   He accidentally cut a gash in his hand.

   Source: Dong Chinese Dictionary

4. 这把菜刀不小心磕在石头上，崩了一个口子。

   zhè bǎ cài​dāo bù xiǎo​xīn kē zài shí​tou shàng, bēng le yī gè kǒu​zi.

   This kitchen knife was accidentally struck against a stone, and a chip was taken out of the blade.

   Source: Dong Chinese Dictionary

5. 他们家一共五口子人。

   tā​men jiā yī​gòng wǔ kǒu​zi rén.

   There are five people in their family in total.

   Source: Dong Chinese Dictionary

6. 我们绝不能开这个口子。

   wǒ​men jué bù néng kāi zhè gè kǒu​zi.

   We must never set this precedent.

   Source: Dong Chinese Dictionary

7. 你家那口子今天怎么没来？

   nǐ jiā nà kǒu​zi jīn​tiān zěn​me méi lái?

   Why didn't your spouse come today?

   Source: Dong Chinese Dictionary