You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

[EX Q]: the box became weaker after it was soaked in water but the bowl is still strong because the _ is waterproof.
[EX A]: bowl

[EX Q]: Erin got a massage every week to relax her muscles, but it didn't help much with her joints so the _ still ached.
[EX A]: joints

[EX Q]: The cliff face was intimidating for the bikers to climb, so they biked the road instead, as the _ was so difficult.
[EX A]:
cliff