He returned from a long journey and was exhausted and wandering aimlessly.

He was standing at the top of the mountain.

His actions led to the problem.

That accident was caused by his lack of attention.

The mesosphere is a part of the Earth's atmosphere, located between the stratosphere and the thermosphere.

He likes to write novels.

The Democratic People's Republic of Korea is located in Asia.

He feels like a loner at school.

If you grow vegetables in this good quality soil, you can get very delicious vegetables.

He is studying the history of the Taiping rebels.