收割后的玉米田里，秸秆散落一地。

The harvested corn field is littered with ___stalks.

那个陌生人连续几天在公园里跟踪我，让我很不安。

The stranger was ___stalking me in the park for several days, which made me very uncomfortable.

猎豹悄悄地跟踪着羚羊群。

The cheetah silently ___stalked the herd of gazelles.