The Fourth Element
  Teacher: What are the four element of nature?
  Student: Fire, air, earth, and... and ...
  Teacher: And what? Just think it over, what do you wash your hands with?
  Student: Soap!

第四元素
  老师:自然界的四大元素是什么?
  学生:火、气、和。。。和。。。
  老师:和什么?想一想, 你用什么洗手的?
  学生:肥皂。


NOTE
just think it over 好好想一想
what do you wash your hands with? with表示用… what是with的宾语