Shinjiro is my best friend.

Mr. Shindo is my best friend.

His country was sanctioned by other countries due to nonpayment of tribute.

He is planning to advance to graduate school next year.

He decided to advance to graduate school after graduating from university.

His body was surprisingly flexible.

I am very interested in natural science.

Let's participate in the election by using early voting.

It's difficult to understand the context of this sentence.

He was diagnosed with congestive heart failure.