1. It if necessary to reduce the number of cars in Seoul.
2. It is the fact true that the advertisement advertising encourages people to buy unnecessary things.
3. It is important that teenagers have get work experience from an early young age.
4. A man's dedication makes the difference between failure and success.
-> It is a person's dedication that ~
5. It costs a large amount of tax money to improve roads and highways.
6. People strive for success in their daily life.
-> It is success that people strive for in their daily lives.
7. There are dormitories that/which offer high speed internet access.
8. There are few benefits to watching TV.
9. In the future, there will be little use for the post office due to email.
10. In the future, there will be many online universities.
11. It is unlikely that people ever be satisfied their with what they have belongings.
12. There is some experience to shape someone's life.
-> There are certain experiences that shape a person's life.
13. Email makes it easy to keep in touch.
-> Email has made it easy for people to keep in touch.
14. It is hard for me to put down my favorite book.
15. There is the time for teenagers to make their own decision.
-> There is a time when teenagers must start making their own decisions.