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Important as they are, genes alone are never absolutely ____(是......的原因) any trait.

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The following case illustrates what happens to identical twins when they are ____(抚养) in contrasting environments.

When she was in the third grade, the family moved to a rather isolated part of the Canadian Rockies, where there were no schools, and Gladys' formal education ____(结束), and was not resumed until the family moved to Ontario.

Helen was confident, graceful, ____(充分利用) her personal appearance, and showed considerable polish and ease in social relationships.

Exceptions occurred when one twin had developed a rather severe illness and the other had not; but ____(总的来说) everyone is impressed by the great psychological and physical likenesses that exist between identical twins, even those who have been separated from infancy.