Answer to last riddle: The dictionary
Rebeca was throwing a party. Julia her friend was helping her set up. Rebeca did decorations and music. Julia did the food and cold iced drinks. After everyone had arrived Rebeca was looking for Julia but could find her so she checked her phone. On her phone Julia had texted her that she had a family emergency to go to but she had a glass of punch and appetizers before she left. After everyone had a drink they made a toast but seconds after everyone drank they dropped dead.
How did Julia survive but the others didn't when they all had a drink?