I would like to visit the Bonin Islands at least once.

I have been to France once.

He finished all his work all at once.

I visit my grandparents' house every summer.

I watched that movie three times.

Ogasawara is my best friend.

I plan to visit the southern archipelago during the summer vacation.

I thought he would be late, but he came on time.

He seems to be very tired.

The reason he is thought of that way is because he always works seriously.