[Q]: How does the sentence end?

The man was able to carry the box but dropped the bag, because the 

[A]: box was lighter.


[Q]: How does the sentence end?

The many found many aquamarine gemstones in the mine, but very few gold nuggets since the 

[A]: gemstones were common.


[Q]: How does the sentence end?

Jason is a good boyfriend but Joseph is not. 

[A]:
Joseph doesn't treat their girlfriends with respect and admiration.