[Q]: How does the sentence end?

Ian knew more about medicine than Michael did because 

[A]: Ian was learning to be a doctor.


[Q]: How does the sentence end?

The photo could not be put into the frame bought for it because the 

[A]: frame is narrow.


[Q]: How does the sentence end?

The hairdresser used a comb on her client instead of a brush because the 

[A]:
comb was wide.