Answer:
- The African Sahara has mesmerized the world for centuries.
- At 3.3 million square miles, this desert is the largest in the world.
- Caravans in search of gold, ivory, salt and slaves made the Sahara the open gate to Africa.
Step-by-step explanation:
- "African" because the word is an adjective, describing a noun.
- "largest" because a superlative adjective is required.
- "open" because it remained open and didn't 'close' at the time being described.
Hope this helps!