老师的歌声一响起，教室里就安静下来了。

Lǎoshī de gēshēng yì xiǎngqǐ, jiàoshì lǐ jiù ānjìng xiàlai le.

As soon as the teacher started singing, the classroom became quiet.

听到熟悉的歌声，她一下子就哭了。

Tīngdào shúxī de gēshēng, tā yíxiàzi jiù kū le.

Hearing the familiar singing, she suddenly started to cry.

他们的歌声把大家都吸引过来了。

Tāmen de gēshēng bǎ dàjiā dōu xīyǐn guòlái le.

Their singing attracted everyone over.