He found a sculpture of a double-headed dragon.

He instinctively scratched his head when faced with a difficult problem.

He scratched his head when faced with a difficult problem.

What is the reason for his actions?

That movie is really good, isn't it?

I was chosen as a member of that committee.

I am a member of that committee.

Mr. Iijima is my best friend.

Mr. Iino is my best friend.

He is a crew member of that ship.