God only knows what he is thinking.

He turned on the headlights and drove down the night road.

The headlight of my bicycle has broken.

I am interested in the culture of China.

He is good at reading Chinese text.

I am busy with work during the day.

I work during the daytime.

He is researching the functions of the midbrain.

He was watching the television relay.

He was relaying the soccer match on TV.