Final answer:
The term 'liters' should be used in the sentence, because the metric system uses liters as a standard measurement for liquids. Therefore, the sentence would be: Go to the store and buy 4 liters of root beer for the party.
Step-by-step explanation:
The blank in the sentence should be filled in with the term 'liters'. This is because root beer is a liquid, and the metric system uses liters (L) as a standard measurement for liquids. In practice, it's common to buy drinks like root beer in liter amounts - for example, 1-liter or 2-liter bottles.
Here's the sentence with the blank filled in: Go to the store and buy 4 liters of root beer for the party.
Remember: we use meters (m, m2, m3) to measure length, area or volume; liters (L) to measure capacity or volume of liquid; and hectares (ha) to measure areas, especially large ones like land surfaces.
Learn more about Metric System