烟雾飘过屋顶。

Smoke ___drifted ___across the rooftops.

当云朵飘向地平线时，光线逐渐消失。

As the clouds ___drifted ___towards the horizon, the light faded.

小船随水流漂向下游。

The boat ___drifted ___down the river with the current.