[Q]: How does the sentence end?

The fisherman couldn't attach the motor to the plank on his boat, because the 
OPTIONS:
- plank was too light.
- motor was too light.

[A]: plank was too light.


[Q]: How does the sentence end?

I allow my kids to download puzzle apps, not anime apps, I think the 
OPTIONS:
- puzzle apps are educational.
- anime apps are educational.

[A]: puzzle apps are educational.


[Q]: How does the sentence end?

The man cut the nail of the dog, but not its hair, so the 
OPTIONS:
- nail must have been short.
- hair must have been short.

[A]:
hair must have been short.