underground

东京的地铁系统以高效和准时著称。

The ___underground in Tokyo are known for their efficiency and punctuality.

伦敦地铁是世界上历史最悠久的地铁系统之一。

The London ___Underground is one of the oldest subway systems in the world.

从火车站到博物馆，坐地铁很方便。

It's convenient to take the ___underground from the train station to the museum.

地铁站就在购物中心旁边。

The ___underground station is next to the shopping centre.