Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: solar energy is an inexhaustible resource
A person needs to make a stove run with only energy that will run forever, so they make a?

Fact: if a liquid disappears then that liquid probably evaporated
If a liquid disappears then what probably happened to it?

Fact: animals taste flavors

Cows know there is salt in a mineral lick because?