士兵们匍匐穿过狭窄的隧道。

The soldiers ___crawled through the narrow tunnel.

排队的人群缓慢向前移动。

The line of people ___crawled forward slowly.

为了保住工作，他在经理面前卑躬屈膝。

He ___crawled before the manager to keep his job.

旧面包上爬满了蚂蚁。

The old bread was ___covered with ants.