Answer:
The author makes this part of the story exciting by using strong action words.
Step-by-step explanation:
The author made sure to convey Elizabeth's feelings to readers through action words in this passage. When he/she mentions the way Elizabeth's heart is beating and how she tosses and turns in bed, the author is showing us, through those actions, how exciting the idea of becoming a doctor is to Elizabeth. Readers can empathize with the way she feels - all of us have experienced excitement and anticipation to the point of tossing and turning in bed, or to having our hearts beat loudly and rapidly.