.--- I’m sorry I stepped outside for a smoke. I was very tired.. --- There is no ________ for this while you are on duty.

Having a fever is the ______________ of SARS.

Finding information in today’s world is easy. The ______ is how you can tell if the information you get is useful or not.

 I can’t say which wine is best—it’s a(n) __________ of personal taste. 

—I am afraid no one will agree with you.    —I don’t think it ______ .