—I am afraid this pair of shoes is a little expensive．—If you really want to buy them, I will give you a ____ of 10 percent．

—Where does your sister work, Jack? —She works in a ___________. 

The result might not as satisfactory as expected but the ________ on his face told us that he was very happy.

It is widely reported in the western media that the drug ______ is now becoming a leading cause of teenager crimes.  

David is the current holder of the 5,000-meter world record, but there is no ____ that he will win in the Olympic Games.