This problem is very difficult.

We should go forward.

He voluntarily took on the job.

We will contact you as soon as we confirm the progress of the construction.

He has been diagnosed with manic depression and is receiving treatment.

The forest is quiet.

He took an arrow out of the quiver.

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

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

I have been to Motsu-ji.