Ameliorate Sharecropping

Directions: Students should ameliorate the following sentence, in red. There are 2 missing commas and a missing period.

Sharecropper's was assigned a plot of land to work and in exchange owed the owner a share of the crop at the end of the season usually one half the owner provided the tools and farm animals.

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SUGGESTED ANSWER: 
Sharecroppers were assigned a plot of land to work, and in exchange owed the owner a share of the crop at the end of the season, usually one half. The owner provided the tools and farm animals.