She stayed at home and did housework until she was seventeen, and then went to work in a knitting ____(工厂).
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The relative effects of heredity and environment are most clearly ____(看得到的) in identical twins.
Therefore heredity is fate, a kind of ____(命运) .
Therefore, as one might expect, they maintained the closest ____(相似) to each other in physical appearance, height, and weight.
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 came to an end, and was not ____(中断之后继续) until the family moved to Ontario.