This is a valid answer.
The school had to see if each students ID cards were valid before entering the school dance
"What if the credit card number isn't valid?"
The professor engaged the students in a Socratic dialogue to encourage critical thinking and discussion of complex philosophical concepts.
I am not writing a sentence using that word.
Of course. The shortest valid such sentence would be: "It is."
I can give you a sentence using the word galaxy.
This is a sentence using the word aviator.
a sentence using the word endotracheal
This is a sentence using the word monomer. :P
I am saying a sentence using the word collagen.
this is a sentence using the word armchair.
Need a sentence using the word crater?