Einstein’s most famous theory is ______ we call the Theory of Relativity.

Mary is no longer__________ she was 5 years ago

I’d like to start my own business — that’s _____ I’d do if I had the money.

 ____ I want to know is ____ I can master English in the shortest possible time.

—The two people speak different languages and can not communicate with each other well.—Oh，I see. That’s ________ misunderstanding occurs.