He chronicled his life in a journal.

Ki is my best friend.

He solved a large number of problems.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.

He was deeply involved in the politics of the republic.

His new game is very popular in the netizen community.

He is studying the history of the republic.

This railway was privatized.