200
Chemists ______ new drugs.
What a wonderful _________.
Chimney smoke and car fumes _______ the air we breathe, making it unsafe for us to inhale.
Air _________ is bad in many cities.
A ______ is a building where young people receive education.
This washing _______ is the latest model.
The tower was a unique ____________.
_______ is a terrible disease.
I'm going to Spain in ____.
It was especially hot this ______.