Commas

During lunch, at the campus cafeteria, Mildred noticed the dirty tables, the overworked cashiers, and the exorbitant price for a watery soda.

• remove the comma after lunch?

• remove the comma after cashiers?

Melissa couldn’t study for her comma quiz, because she was joy riding on the Enterprise with Mr. Spock, whom the US Air Force chased with its fastest jets

• remove the comma after quiz

• remove the comma after Mr. Spock

The slimy smelly lettuce on my burrito made me ask the manager to return my 99 cents.

• add a comma after slimy

• add a comma after burrito

. Sitting in the atrium, Marcus chatted pleasantly with a pretty student from his chemistry class, but then he had to leave suddenly, because he noticed that he had only thirty seconds to get to Professor Spottke’s English class on time.

• remove the comma after atrium

• remove the comma after suddenly

To study for his calculus midterm, Brian drank seven cups of strong Turkish coffee which kept him wide awake for the all-nighter.

• remove the comma after midterm

• add a comma after coffee