阳光明媚的日子里，胖乎乎的熊蜂在花园里忙碌地采集花粉。

On sunny days, plump ___bumblebees busily gather pollen in the garden.

孩子们在教室里跑来跑去，不时撞到桌椅。

The kids ___buzz around the classroom, bumping into desks and chairs.