Vocabulary
Because she was the only language arts teacher and she was strict, Mrs. Granger had earned this.
What is a reputation?
Mrs. Granger sent this home, and it impressed Nick's mom.
What is a letter?
Amazingly, Mrs. Granger never took off her jacket, even in hot weather, because she never did this.
What is sweat?
In addition to her weekly vocabulary tests, Mrs. Granger also had this on the blackboard for students to write down.
What is the "Word for the Day"?
By saying that Mrs. Granger's smile was "too sweet", the author is telling us this.
What is that Mrs. Granger knew what Nick was up to?