Final answer:
Before arriving at their destination, George loses patience with Lennie because he lies about the dead mouse, wants ketchup with his beans, and drinks out of George's canteen.
Step-by-step explanation:
Before arriving to their destination, there are several things that cause George to lose patience with Lennie:
- Lennie lies about having the dead mouse in his pocket.
- Lennie wants ketchup with his beans.
- Lennie drinks out of George's canteen.
These actions by Lennie demonstrate his forgetfulness and lack of awareness, which frustrates George and tests his patience.