People all over the world are all ______ about the relationship between China and Japan.

will never understand how it ______ that you failed in the examination for you are such a good student.

I wonder how it ____ that Chinese climbers successfully finished the torch relay on the Mount Qomolangma, where the air is so thin.

The tigers are_______ and I don’t like them.

Lincoln’s mother did ___ many books ___ him.