Studying the history of the Imperial Examination is important for understanding the past of our country.

Maintaining oral hygiene is very important for overall health.

He is working at the pithead.

Sexual intercourse is one of the basic human desires.

They were having sex in secret.

I always carry a reserve battery.

He decided to call his friend to the park.

I go to the gym four times a day.

He was treated to a delicious dinner by his friend.

My father works at a law firm in Tokyo.