length|lengths

你能游一个泳池的长度吗？

Can you swim a ___length of the pool?

这条路的长度是两公里。

The ___length of the road is two kilometers.

这堂课的长度是50分钟。

The ___length of the lesson was 50 minutes.

他无法集中精力工作任何一段时间。

He is unable to concentrate on his work for any ___length of time.

他写了关于这个主题的不同长度的书。

He has written books of various ___lengths on the subject.

所有文章都应该有相似的长度。

All essays should be of a similar ___length.