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: damming a river can cause a lake to form
If a beaver does what it does in order to build its home, then near the river will form?

Fact: magnifying glass is used to see small things by making objects appear bigger
A magnifying glass?

Fact: a chipmunk eats acorns

a student leaves a bag of acorns on the playground, which one of these will most likely take it?