3 sentences

1. 我只是随口问问。

   wǒ zhǐ​shì suí​kǒu wèn​wen.

   I was just asking.

   Source: OpenSubtitles

2. 他只是随口说说，你千万别当真。

   tā zhǐ​shì suí​kǒu shuō​shuo, nǐ qiān​wàn bié dàng​zhēn.

   He just said it offhandedly; don't take it seriously.

   Source: Dong Chinese Dictionary

3. 他在路边随口哼唱起一支旋律优美的曲子。

   tā zài lù​biān suí​kǒu hēng​chàng qǐ yī zhī xuán​lǜ yōu​měi de qǔ​zi.

   He casually hummed a beautiful melody by the side of the road.

   Source: Dong Chinese Dictionary