[Q]: How does the sentence end?

Brian wanted to teach Robert how to paint using watercolors but

[A]: Robert was a bad learner.

[Q]: How does the sentence end?

The parasites were less deadly to the people in the tents than in the house because the parasites stayed out of the

[A]: tents .

[Q]: How does the sentence end?

Neil asked Leslie when the zoo's aquarium exhibit was closing because

[A]:
Neil was not sure.