句型转换。

1. The boy's mother usually walks to the office. (改为同义句)

    The boy's mother usually goes to the office _____ _____.

2. Mr. Turner bought the car three years ago. (改为同义句)

    Mr. Turner _____ _____ the car for three years.

3. This story excited me most. (改为同义句)

    _____ _____ stones could make me so excited.

4. What do you think of the book Harry Potter? (改为同义句)

    _____ do you _____ the book Harry Potter?

5. You must hand in your history homework by the weekend. (改为被动语态)

    Your history homework _____ _____ _____ _____ by the weekend.

简述高血压治疗时降压药物的选择及联合应用。