Answer; It can't be filled; Because 1. Bus cards are often purchased and used by month, and the validity period of each month is fixed.
Therefore, a bus pass purchased in September will expire in October and will no longer be used.
2. The rules of using the bus card are calculated according to the month, the purchased card is generally only valid in one month, so at the beginning of the next month, you need to buy a new bus card. This is because the cost of the bus card is calculated according to the month, and it is paid regularly every month, so it can only be used within the corresponding month, and can not be used after the expiration. 4. If you want to continue to take the bus, you need to buy a new bus card to use in the next month.