她用筷子敲打碗边，发出咔嗒声。

She tapped the bowl's edge with chopsticks, making them ___clack together.

孩子们在教室后面叽叽喳喳地闲聊，老师不得不让他们安静下来。

The kids ___clatter away at the back of the classroom, so the teacher has to ask them to quiet down.