---What do you think of the dinner in Mr Brown's?---Oh, great! We have never had a better one. It's a dinner of twenty ____.

The practice of hanging clothes across the street is a common ______ in many parts of the city.

 They were trying to remove harmful ______ from cigarettes.

You should follow _____ of the medicine, and take three pills every day.

The new safety regulations were agreed on after _____ with the work-force.