1. Spending time alone is as unhappy as sharing time with friends.
-> is not as pleasant as
2. The time when I was university student was the most rewarding time in my life.
-> College was the most rewarding time of my life.
3. It is likely to encourage learning most when the students get several short vacation.
-> Giving students several short vacations will most likely encourage studying.
4. By waking up early, I have extra time to either exercise or eat breakfast.
5. A large salary allow me to either buy home or save the money for the future.
6. Business research center will be helpful to both local economies and neighboring economies.
-> A center for business research will help both the local and neighboring economies.
7. Physical education should be required not be optional.
-> should be not optional but required.
8. Strong communication skill is important not only in business matters but also in personal matters.
9. I fount that working in at a small corporation is as rewarding as working for at a large corporation.
10. Teenagers should focus more on studying rather than earning money.
11. I like getting my job done quickly as soon as possible.
-> I prefer to get things done as quickly as possible.
12. The literature class is not as useful as science class.
13. For some people, pets are as close as family members.
-> To some, pets are as close as family members.
14. Usually, Commonly, younger people are more open-minded than older people.
15. Large corporations are more stable than small companies.