Christine knew how to plant a crop better than Carrie , so 
OPTIONS:
- Christine stayed in the field.
- Carrie stayed in the field.
Christine stayed in the field.

The light did not make it to the other side of the room through the curtain because the 
OPTIONS:
- curtain was heavy.
- light was heavy.
curtain was heavy.

Nelson did not have to practice football very hard, but Eric did as 
OPTIONS:
- Nelson was naturally very good at it.
- Eric was naturally very good at it.
Nelson was naturally very good at it.