The environmental issues are becoming more serious.

Environmental issues are becoming more serious day by day.

He solved a large number of problems.

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

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I am very interested in social science.

He was considering charcoal-burning suicide, but with the help of a friend, he abandoned that thought.

He chose self-immolation as a form of protest.

He chose self-immolation as a form of protest.