For step-by-step solutions to specific exercises, platforms like Skysmart Solutions provide digitized answer keys for both the textbook and the workbook.
— appearing in reading dialogues, such as Miss Chatter offering "a nice piece of bread and butter". Related Vocabulary (Unit 6)
In the context of food shopping (Unit 6, Section 3), "piece" is used to describe portions of food: — used to mean "a slice of cake".
— often found in exercises requiring students to match containers/quantities with products.