Problem: How does the sentence end?

The student couldn't understand the books as well as the movies, because the 
OPTIONS:
- books had simple explanations.
- movies had simple explanations.
Answer: movies had simple explanations.
sentence: Betty needed to get measured for a new bra and Angela said she could help.  OPTIONS:
- Betty felt self conscious being undressed in front of a her friend.
- Angela felt self conscious being undressed in front of a her friend.
complete: Betty felt self conscious being undressed in front of a her friend.
The load dropped at the side of Matthew when he was carrying it with Samuel because 
OPTIONS:
- Matthew is weak.
- Samuel is weak.
Matthew is weak.
Input: Continue writing.

Having blackheads made Matthew self-conscious, but Eric didn't care about having them. 
OPTIONS:
- Matthew had always been confident about their skin.
- Eric had always been confident about their skin.

Continued: Eric had always been confident about their skin.
Story needs to be completed:
Emily lent Rebecca her new vampire book because 
OPTIONS:
- Emily hadn't bought the book yet and wanted to keep up with the series.
- Rebecca hadn't bought the book yet and wanted to keep up with the series.

My choice:
Rebecca hadn't bought the book yet and wanted to keep up with the series.
Problem: How does the sentence end?

She used the blender instead of the knife to grind up the strawberries and make a slushie. The 
OPTIONS:
- blender was slower.
- knife was slower.
Answer:
knife was slower.