The wealth of a country should be measured ________ the health and happiness of its people as well as the material goods it can produce.
B
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We must ______ that the experiment is controlled as rigidly as possible.
For the new country to survive, ________ for its people to enjoy prosperity, new economic policies will be required.
Since William had been seriously ill for several months, his parents were worried about________ to return to school full-time.
A baby might show fear of an unfamiliar adult, _______ he is likely to smile and reach out to another infant.
Construction of the railways helped to develop the national _______ of Tanzania and Zambia.