Shimawaki is my best friend.

I have been to Green Island.

Mr. Taira is my best friend.

Mr. Shima is my best friend.

Mr./Ms. Minoshima is my best friend.

He was fascinated by the beautiful scenery of the southern country.

He is from a grand duchy.

His research is mainly about the ancient Chinese Kyūjitai form of 国号.

Yesterday, the President of the United States visited Japan as a state guest.

Japan adopted a policy of national isolation during the Edo period.