That's your responsibility, why did you forget?

He lived in Japan for 10 years.

He is a fourth grader.

I wonder what kind of year this will be.

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.

This is the most difficult case I have ever faced.

Please proceed one by one in order.