TASK DEFINITION: In this task, you are given a word. You should respond with a valid sentence which contains the given word. Make sure that the sentence is grammatically correct. You may use the word in a different tense than is given. For example, you may use the word 'ended' in the output where the given input word is 'end'.
PROBLEM: floor

SOLUTION: Many sunken ships rest on the ocean floor.

PROBLEM: rock

SOLUTION: That mountain is solid rock.

PROBLEM: hollow

SOLUTION:
He built himself a cabin in a hollow high up in the Appalachians.