It was time to register for the new semester. Sarah was excited. After a quick breakfast, she logged into her school's website. As she clicked through the course catalog, Sarah felt a little nervous. She had heard that some classes filled up quickly. With a deep breath, she selected the history class and added it to her cart. Then, she moved on to her other choices, like art, mathematics, and so on. Her classes were all available. They fit perfectly into her timetable. Sarah reviewed her choices, making sure she had selected all the classes she planned to take. Then she clicked the "Submit" button. A message appeared on the screen confirming her enrollment.
