To complete the sentence correctly, we can choose from the following words:
- "of" or "in" for the first blank.
- "animals" or "children" for the second blank.
Thus, the completed sentence could be:
"In the fields of several animals. At the barn, the farmer in the stalls putting down hay."
or
"In the fields in several children. At the barn, the farmer in the stalls putting down hay."
The first choice makes more sense contextually, so the best completion would be:
"In the fields of several animals. At the barn, the farmer in the stalls putting down hay."