按要求完成句子。

1. My father is at work. (同义句)

    My father ______.

2. The story isn't interesting, I think. (同义句)

    I _______ think the story _______.

    I _______ the story is _______.

3. Where is your friend from? (同义句)

   Where ______ your friend ______ from?

4. My birthday is in November. (同义句)

    I _______  in November.

5. Mr. Wang lives in Chengdu. (一般疑问句)

    _______ Mr Wang ______ in Chengdu?

造成内燃机损伤的原因是多方面的，其中最主要的是（）。

A．疲劳

B．热损伤

C．磨损

D．腐蚀