按括号内的要求转换下列句式，每空一词。

1. Midori was born in 1971. (对划线部分提问)

    ______ ______ Midori born?

2. He hiccupped for six years. (对划线部分提问)

    ______ ______ did he hiccup?

3. He began to play for his national team when he was 15. (变为同义句)

    He began to play for his national team at the ______ ______ 15.

4. Charles Smith won first prize in his group. (对划线部分提问)

    ______ ______ first prize in his group?

5. He could hum songs when he was a small boy. (改为否定句)

    He ______ ______ songs when he was a small boy.