我们无法获得资金，因此不得不取消这个项目。

We couldn't secure funding and ___therefore had to cancel the project.

我想让我的车看起来更时尚。因此，我打算安装一套新的音响系统。

I want to update my car's look. ___Therefore, I'm planning to install a new sound system.

油价正在上涨，因此更多的人开始使用公共交通工具。

Gas prices are rising, ___therefore more people are using public transportation.