Underline essential clause in each sentence.

1) the day that i had my son was the best day of my life.
2) the gorilla who was snoring in the corner was my favorite animal at the zoo.
3) the customer who ordered the iced tea was so rude to me.
4) the checker on lane three is the fasted and most friendly.
5) katie's best friend lives next to the walmart on 29th street.