他小心翼翼地踩着石头穿过小溪。

He ___trod carefully on the stones to cross the stream.

孩子们在雪地里踩出了深深的脚印。

The children ___trod deep footprints in the snow.

她在湿滑的地板上小心翼翼地行走。

She ___trod carefully on the slippery floor.