题目内容

The old man lived a ______ life after his retirement.

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Leisure in our society is often defined ______ work.

Social ______ , in short, means the movement of a person or a group from one social class to another within a given society.

Millions of years ago, changes in the earth's climate caused animal and plant life to ______ .

We are planning to ______ a supermarket in the town.