When I spent my holidays in Europe, I bought _______ vases.

Those who don’t get their sufficient sleep are actually sending a(n) _____ to severe problems in their life.

The purpose of the campaign is to raise the public’s_______ of the dangers of passive smoking.

Thanks to the modern electrical_____, housework nowadays has been made easier and easier.

Companies are struggling to find the right _____between supply and demand, but it is no easy work .