5 . 写出下列句中划线部分的成分
1. Some parents will buy any high-tech toy if they think it will help their child.   (        )
2. The researchers analyzed video recordings of 53 child-parent pairs during everyday activities at home. (        )
3. All customers travelling on TransLink services must be in possession of a valid ticket before boarding. (        )
4. I have a special place in my heart for libraries.   (        )
5. I was always an enthusiastic reader, sometimes reading up to three books a day as a child.   (        )
6. My first job was working at the Ukiah Library when I was 16 years old.   (        )
7. It’s hard to tell exactly how many people agree with him.   (        )
8. Smiling is a result of having fun.   (        )
9. People with a history of such injuries might want to be cautious in adopting the sport.   (        )
10. The room was in total darkness.   (        )