<human>: How do you do this: How do I keep my freezer smelling fresh?

OPTIONS:
- Open small container of yogurt and place open container in the freezer.  Mark calendar to purchase new container in four months.
- Open small slot of baking soda box top.  Place baking soda box on freezer door.  Mark calendar to purchase new box in four months.
<bot>: Open small slot of baking soda box top.  Place baking soda box on freezer door.  Mark calendar to purchase new box in four months.