7 Look at the grammar box. Complete these rules (a−c) with a/an, the, or no article (x).
a We normally use_________ when we talk about something that isn't specific or when it's the first time we mention something. When we talk about something specific or talk about it again, we use_________.
b We also use_________ when something is unique (there is only one), with superlatives, or with the names of some places (e.g., oceans, deserts, mountain ranges).
c We use_________ when we talk about people or things in general, and with the names of most places (e.g., continents, countries, cities, lakes).