Here are the correct options for the sentences:

1. City people seem to react **more quickly** to changes than countryside people.
2. She came to the party **later** than her friends.
3. Does a computer work at calculus **faster** than a human being?
4. Nga writes English essays **better** than Mai.
5. Nick can jump **higher** than Mike.
6. Today it's raining **more heavily** than it was yesterday.
7. Juice contains **more** vitamins than coke.
8. The farmers in my village work **harder** than the ones here.
9. People in rural areas talk **more optimistically** than city people.
10. Ms. Sarah dances **more beautifully** than Ms. Susan.