我们用一根绳子把船系在柱子上。

We tied the boat to a post with a ___rope.

过了一会儿，她从背包里拿出一根绳子。

A few moments later she took out a ___rope from her backpack.

他买了一根结实的绳子用于攀爬。

He bought a sturdy ___rope for climbing.