It’s a great _______ for a person to be able to speak fluent English when he is seeking a job.

Scientists are hoping for a _____ in the search for a cure for cancer. 

—Do you know what _____ influenza A (H1N1) has? —A high temperature, throat pain and so on.

In order to create a comfortable shopping environment, the mall placed a(n)     on smoking.

You don’t have to worry about the journey because I have made a ______ on the Indian Pacific train to Perth.