按要求转换下列句式，每空一词。

1. His friend is from Canada. (改为同义句)

    His friend ________ ________ Canada.

2. Is there a post office near here? (作否定回答)

    ________, there ________.

3. She plays ping-pong in the morning. (用now改写句子)

    She ________ ________ ping-pong now.

4. She wants to be a doctor. (对划线部分提问)

    ________ ________ she want to be?

5. Mary is watching TV.  (对划线部分提问)

    ________ is Mary ________?

某人沿着坡度为1：2的坡面前进了10米，此时他与水平地面的垂直距离为______米．