根据要求变换句式。

1. Mr. Smith gave up (放弃) smoking two years ago. (改为同义句)

    Mr. Smith ________ ________ two years ago.

2. You must be quick. If not, you'll miss the early bus. (改为同义句) 

    ________ quick, ________ you'll miss the early bus.

3. I don't know what I should do with the letter. (改为简单句)

    I don't know what ________ ________ with the letter.

4. My father asked, "Shall we go to work by bike everyday?" (改为宾语从句)

    My father asked ________ we ________ go to work by bike everyday.

5. "Don't play football on the street, little boys," the policeman said. (变成间接引语)

    The policeman told the little boys ________ ________ ________ football on the street.

尸冷至与环境温度相同时，一般是在死亡后()

A．10小时

B．14小时

C．18小时

D．20小时

E．24小时