His room was empty of air, making it hard to breathe.

She is feeling unwell because she is on her period.

His complexion was gloomy, as if there was some problem.

His expression was gloomy, as if there was some problem.

He took an arrow out of the quiver.

I have been studying all the time.

I have been to Motsu-ji.

His possible course of action was to start a new business.

He has been doing that job for over 10 years.

She took a day off from school because of her menstruation.