From the ___ expression on her face, we knew that the problem was ____.

Some experts argue that the reason why the price of houses can’t drop is that the supply is not ______ to the demand.

The information was only given to a ____group of reporters.

Having been praised by the teacher，the little girl ran back home，______.

Smile is recognized as a/an _________ language, which can be understood by people all over     the world.