The tomato juice left some _____ on a customer’s skirt, which made the waitress nervous.

I can't say which wine is better—it's a(n)________of personal taste. 

 In Scandinavian countries it is common ____ for the husband to stay at home to look after the baby.

---How many ________ are there in your school?  ---There are fifty-five.

Many people complain of the rapid ________ of modern life.