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.

He experienced nantaimori for the first time.

He is working as a member of the International Criminal Police Organization.

Special judicial police officers are working hard every day to protect the law in Japan.

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.