Answer:
The Roman army and a number of strategically placed forts ensured that the empire was defended against hostile local peoples, and an efficient network of roads was built both to allow troops to move swiftly within the empire and to facilitate trade.
Explanation:
Just write a random answer
also use the idea's your teacher gave you.
Answer: "It's a dog" and "Who's that?"
The comma is putting together and shortening 'it is' and 'who is'.
