There is a new problem involved in the popularity of private cars _______ road conditions need _______.
We bought the big house with the saving we had _____ for several years.
.Children often have very _____ imaginations.
Employees in a chemical factory should be given _____ training in safety.
Fat on human beings is _____ in different ways.
On the annual International Volunteers Day, the world _____ the work of millions of people who give their time to help others.