[Q]: How does the sentence end?

The test was hard for Samuel but a breeze for Randy , since 

[A]: Randy had worked to study for it.


[Q]: How does the sentence end?

the rope could not support because of his weight  he fell because the 

[A]: rope was too light.


[Q]: How does the sentence end?

The teacher used a reward system and Robert won an award while Logan did not because 

[A]:
Robert studied a lot harder.