The police are offering a __________to anyone who can give information about the lost key.

You’d better put the milk in the fridge, which has a _______ to go bad in hot weather.

 A sense of __________ is the basic requirement for people working in the service industry,     such as education and health care.

—Henry has been teaching English in Beijing university for many years.—It’s no __________ he can speak Chinese so well and idiomatically.

I haven’t started writing my novel yet—I am still waiting for ______.