1 . Directions: Complete the following sentences by using non-restrictive relative clauses.
1. Most young people think fast food, ______________________________（那些专家认为是不健康的）is fashionable and tasty.
2. Americans, ______________________________(总是匆匆忙忙的), prefer hamburger stands to restaurants.
3. Mr. Smith, ______________________________(他的夫人是中国人), speaks' Chinese fluently.
4. They flew to New York, ______________________________(他们在那儿呆了三天),and then went on 'to Washington DC.
5. They will put off the party until next week, ______________________________(那时他们的父母会在家).
6. Next week, I will go to see my former classmates, ______________________________(他们中的许多人已经结婚了).
7. The volunteers, ______________________________(绝大多数是大学生)，are willing to help the old.
8. The Earth, ______________________________ (它的70%被水覆盖), is also called the water plant.
9. These two books, ______________________________(两本都不是这个国家出版的)，have attracted millions of readers.
10. The photographs, ______________________________（没有一张是好的），cost me $100.