[Q]: How does the sentence end?

Sarah had to authorize the purchase for Jessica, because

[A]: Sarah was still a teenager under the age of 18.

[Q]: How does the sentence end?

The floor could not withstand the cat's scratches, but the wall was unscathed, since the

[A]: wall was impervious to them.

[Q]: How does the sentence end?

The roots of the plants started to grow out of the pots because the

[A]:
pots were too short.