It was most careless of me. I mistook the time for work.

我真是太大意了，弄错了上班时间。

Russia has the most reckless, but at the same time skillful, drivers, and the most careless pedestrians in the world.

俄罗斯有世界上最横冲直撞但同时技术又最娴熟的驾驶员，以及最粗心的行人。