Who is the woman in black?— ________ is our physics teacher.

Have you seen the funny movie Let the Bullet（子弹）Fly?— Yes, it made me _________ many times.

The key may be in your bag.—.

Before I talked with ______ scientist, I had never met_____ clever person like him.

Jim wants to be a volunteer in the 2010 World Expo.—. [ ]