Answer:
The answers are "violation", "unenforceable" and "illegal" respectively,
Explanation:
The statement is thus rewritten below:
"Any contract to commit a crime is in___violation________ of a statute and therefore unenforceable. A contract to sell illegal drugs in violation of criminal laws is ____unenforceable_____ because it is a crime. A contract to smuggle undocumented workers into the United States for an employer is__________illegal_ and therefore unenforceable".