This is a test of commonsense. Complete the next sentence:

How to make citrus popsicles
Pour lemonade into four popsicle molds or plastic cups.
Don't fill them up completely because when they are put in the freezer, the lemonade may go over the brim because it will expand.
Place the popsicle sticks in the middle of each mold.
Make sure not to spill any lemonade while you doing so. Freeze for about a day or until they are fully solid.