obstruction

路上的大石头成了我们前进的障碍。

The large rock on the road became an ___obstruction to our progress.

施工队的卡车造成了道路堵塞。

The construction trucks caused an ___obstruction on the road.

他在比赛中因阻挡对手而被判犯规。

He was called for ___obstruction after blocking the opponent's path.