Widespread immunization eradicated ______, the most lethal disease of all for children.
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Question 2A newly developed vaccine against ______, which causes infant diarrhea (killing half a million children a year), has proved successful.
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Question 3The single most important cause of improvement in child survival in the twentieth century is ______.
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Question 4Worldwide, at least ______ children were born between 1950 and 2010.
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Question 5Although the exact age at which motor skills are acquired varies from one individual to another, the ______ is the same for all individuals.
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Question 6Improvement in ______ is the main reason childhood mortality has declined.
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Question 7Physical abilities that involve small body movements are ______ skills.
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Question 8The three factors that combine to allow toddlers to walk are muscle strength, brain maturation within the motor cortex, and ______.
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