1. seat belt
Put on your seat belt, please.
You must wear a seat belt in cars in this country.
Fasten the seat belt, please.
fasten your seat belt
Fasten your seat belt, please. He undid his seat belt and got out of the car. She put the baby in his car seat and fastened the seat belt.
It’s illegal not to wear a seat belt in a car.
Fasten your seat belts!
You have to wear a seat belt at all times.
Put on your seat belt
Put on your seat belt; please.