He prefers natural foods.

This wood may spontaneously combust if the humidity is high.

His car spontaneously combusted all of a sudden.

Natural rights are rights that humans have from birth.

Kazutoshi is my best friend.

How long is the execution time of this program?

Let's meet at the station at five o'clock.

I wake up at nine o'clock every day.

I wake up at six o'clock every day.

I wake up at eight o'clock every day.