[Q]: How does the sentence end?

Christopher went to ask Eric for advice about savings bonds but 
OPTIONS:
- Christopher forgot how they worked.
- Eric forgot how they worked.

[A]: Eric forgot how they worked.
QUES: Continue writing.

Donald had a much larger appetite than Matthew, so 

OPTIONS:
- Donald did not eat the entire meal nor the leftovers from yesterday.
- Matthew did not eat the entire meal nor the leftovers from yesterday.
+++++++++
ANS: Matthew did not eat the entire meal nor the leftovers from yesterday.
Problem: How does the sentence end?

Her boyfriend gave her the scarf to wear but hid the hat, since he thought the 
OPTIONS:
- scarf looked prettier on her.
- hat looked prettier on her.
Answer: scarf looked prettier on her.
sentence: The coffee machine broke so we used the ratchet instead of the screwdriver to fix it since the  OPTIONS:
- ratchet was longer.
- screwdriver was longer.
complete: ratchet was longer.
Terry applied sun protection while she was at the beach but the 
OPTIONS:
- sun was too weak.
- protection was too weak.
protection was too weak.
Problem: Continue the following story.

Jake replaced his metal bike for a carbon one because the 
OPTIONS:
- metal was very lightweight.
- carbon was very lightweight.
Here's how I want to continue it:
carbon was very lightweight.