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: scraping an object may cause small particles to break off of that object
I use a knife to chip away at what to make a sculpture?

Fact: recycling has a positive impact on the environment
To be a friend of the environment?

Fact: An example of playing a musical instrument is strumming a guitar string

School children often play a musical instrument by?