in和on和by的區別和用法

They crossed the river by ferry.

他們乘渡船過了河。

They paid in cash.

他們用現金支付。

Did you hear it on the radio?

你是從收音機聽到這消息的嗎？

Now I can walk to work instead of going by car.

現在我可以步行去上班，而不必開車了。

In our company, quality is high on the agenda.

我們公司高度重視質量。