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.

People from England made voyages to conquer other parts of the world and _____ that, English began to

be spoken in many other countries. [ ]

A. because of

B. because

C. since

D. as