1. The following shows the steps of adding value in Octopus card. Can you put them in correct order? Motivation A Insert the Octopus card into the card slot B The machine verifies whether the bank note inserted is valid. C If yes, an updated value will be shown on the screen. Otherwise, the inserted bank note will be rejected. D When the green light turns on, insert a $100 or $50 note into the bank note slot. E Press the button to get back the Octopus card.

2. How can the machine follow the correct process every time? Motivation A DCBE

3. How can the machine follow the correct process every time? Motivation A DCBE