I bought a dress for only 10 dollars in a sale ;it was a real _______.

The old woman felt disappointed for she got nothing in _____ for her kindness. 

Before the final examination,many students have shown      of tension.Some have trouble in sleeping while others have lost their appetite(胃口).

 No. 2 Hospital has got a good _______ for fighting against the flu with its careful and smooth organization.

There is a lot of love in today’s world and I’m convinced that this is still the most powerful ______ in the world.