一棵倒下的树挡住了路。

A fallen tree is ___blocking the road.

花了三个多小时，因为发生了车祸，街道被封锁了两个小时。

It took over three hours because there was a car accident and the street was ___blocked for two hours.

警察封锁了入口以防止人群进入。

The police ___blocked the entrance to prevent the crowd from entering.