老师看到学生在课堂上玩手机，发出了啧啧的声音。

The teacher let out a ___tsk-tsk when she saw the student playing with his phone in class.

当她看到孩子把食物扔在地上时，发出了啧啧的责备声。

She gave a disapproving ___tsk-tsk when she saw the child throw food on the floor.