我们步行了一公里才到达那个美丽的湖泊。

We walked one ___kilometre to reach the beautiful lake.

这条跑道一圈是400米，我需要跑两圈半才能完成一公里。

This track is 400 metres per lap, I need to run two and a half laps to complete one ___kilometre.

我的新学校离我家很近，只有半公里。

My new school is very close to my home, only half a ___kilometre away.