Изменить предложение на passive 1. the mayans discovered chocolate 2. when the spaniards arrived the aztecs used chocolate beans as money 3.in the 17th century londoners drunk hot chocolate 4.we have eaten chocolate for years 5.we will use chocolate as medicine

Chocolate was discovered by Mayans. 
When the Spaniards arrived, chocolate beans were used as money.
Hot chocolate was drunk (by Londoners) in the 17th century.
Chocolate has been eaten for years. 
Chocolate will be used as medicine.