We want to leave on the eleventh of August.

我们想于八月十一日离开。

We had to leave on the morrow.

我们明天就得离去。

The first plane is due to leave on October 2.

第一架飞机定于10月2日起飞。

What did you leave on my desk?

你在我桌上放了什么？

Leave on for five to 10 minutes.

保留5到19分钟。