【推荐2】指出下列句子是简单句、并列句、主从复合句还是并列主从复合句。如果是主从复合句，请说明含有什么从句。
1. As we know, vocational education qualifies people to work in a specific occupation.
2. Those who have vocational qualifications and professional competence often have better prospects of promotion.
3. The value of reading is not only recreation, but it also lights a lamp in the mind.
4. Statistics show that it is better to read a few books carefully than to read many at random.
5. Doctors use tablets while working in hospitals, while patients take tablets at home.
6. I will study law until I get a lawyer's qualification certificate.
7. The graduation ceremony was over and the curtain had come down on my university life as if four years had disappeared in a flash.
8. For these years, I rushed from the classroom to the dormitory and from the dormitory to the cafeteria.
9. The people I met were intelligent, mature and responsible.
10. I remember my first assignment was an essay on geometry.
11. I created an outline followed by a draft, and then I borrowed some reference books from the library.
12. After editing and polishing them, I made the first two paragraphs into presentation slides.
13. I bounced ideas off my favourite professor, who was a tall gentleman with a beard.
14. A carriage is one of the separate, long sections of a train that carries passengers.
15. Your forehead is the area at the front of your head between your eyebrows and your hair.