我在新墨西哥州的沙漠里看到一只走鹃飞快地穿过公路。

I saw a ___roadrunner quickly crossing the road in the New Mexico desert.

我弟弟是个飞毛腿，总是第一个到学校。

My little brother is a real ___roadrunner - he's always the first to arrive at school.