根据所给提示，完成句子。每空一词。
1. I think his suggestions are valuable for my study. (改为否定句)
I ______ think his suggestions ______ valuable for my study.
2. Many well-known people took part in this year's Shanghai Film Festival. (改为一般疑问句)
______ many well-known people ______ part in this year's Shanghai Film Festival?
3."Remember to come here on time" The teacher said to Tom. (改为间接引语)
The teacher told Tom ______ remember to ______ ______ on time.
4. The poor boy is called Bob. He lost both his parents. (改成含定语从句的复合句)
The poor boy ______ ______ ______ ______ ______ last year is called Bob.
5. My son won the first prize in the speech contest last week.(改为被动语态)
The first prize ______ ______ in the speech contest ______ ______ ______ last week.
(其中i，j是互相垂直的单位向量)，若