[Q]: How does the sentence end?

Christopher gave lessons to Michael , as 
OPTIONS:
- Christopher had so little piano playing knowledge and experience.
- Michael had so little piano playing knowledge and experience.

[A]: Michael had so little piano playing knowledge and experience.


[Q]: How does the sentence end?

The test could not determine the strength of the battery, but worked fine for the plug , since the measurement for the 
OPTIONS:
- battery was concrete .
- plug was concrete .

[A]: plug was concrete .


[Q]: How does the sentence end?

As Liam became a better writer, he went from using paper to a typewriter because he found using the 
OPTIONS:
- paper to be difficult.
- typewriter to be difficult.

[A]:
paper to be difficult.