Answer:
C. In the ancient world, Rome was the center of a powerful empire.
However, it gradually lost its strength, and in 410 CE it was
invaded and practically destroyed. What factors contributed to
Rome's downfall? Why did it find itself unable to defend its own
walls?
Explanation:
The first question asks what the cause of Rome's downfall was. In the second sentence the effect is Rome was invaded and destroyed.
1. study
2. is known
3. will still be
4. decide to buy
5. knew
6. would not have gotten
7. must choose
8. would never have occured
9. became
10. will be produced
11. will be
12. is
