Nick knew the answers in advance, while Benjamin did not, because 
OPTIONS:
- Nick had studied their textbook.
- Benjamin had studied their textbook.
Nick had studied their textbook.

The scarf Jill purchased for her husband would not fit around his neck, the 
OPTIONS:
- neck was too wide.
- scarf was too wide.
neck was too wide.

Nick quite often likes to drive too fast but Robert never does because 
OPTIONS:
- Nick is sensible.
- Robert is sensible.
Robert is sensible.