她喜欢乘坐火车旅行，因为可以欣赏沿途的风景。

She enjoys ___traveling by train because she can see the scenery along the way.

我喜欢坐火车旅行，因为可以看到沿途的风景。

I enjoy ___traveling by train because I can see the scenery along the way.

我们驾车穿越了整个国家，沿途欣赏了许多美景。

We ___traveled across the country by car and enjoyed many scenic views along the way.

他经常出差工作，走访全国各地的客户。

He ___travels a lot for work, visiting clients across the country.

光在真空中以极快的速度传播。

Light ___travels through a vacuum at an extremely high speed.