这座大桥横跨整个峡谷，连接了两座城市。

The bridge ___spanning the entire canyon connects two cities.

这次展览涵盖了跨越三个世纪的绘画作品。

The exhibition features paintings ___spanning three centuries.

这座桥横跨河流两岸，全长约500米。

The bridge ___spanning the river is about 500 meters long.