Please tell me the way to solve this problem.

We are considering introducing a new voting system.

The police used a water cannon against the demonstrators.

Learning a new input method is difficult.

The history of the Empire of Japan is very interesting.

The calculus of variations is a branch of mathematics that deals with the optimization of functions.

He is studying at law school.

The fire alarm went off, so we immediately evacuated the building.

A tsunami warning has been issued, so please evacuate immediately.

This restaurant has an all-you-can-eat sushi.