将年幼的孩子单独留在家里是违法的。

It's ___against ___the ___law to leave a young child alone in the house.

直到那一刻，玛丽还以为她的叔叔和他的朋友们是走私犯，在做违法的事情。

Until that moment, Mary thought her uncle and his friends were smugglers and were doing things ___against ___the ___law.

无证驾驶是违法的。

Driving without a license is ___against ___the ___law.