请根据要求改写下列句子，每空一词。
(1)Coaches came into use in 1958.        (对划线部分提问)
____ coaches come into use?
(2)He is so energetic that he can be our leader. (改为简单句)
He is energetic____  be our leader.
(3)“Have you finished the report?” I asked him. (改为间接引语)
I asked him ____  had finished the report.
(4)Mike, you mustn’t show off before others when you have success. (改为祈使句)
Mike, ____ off before others when you have success.
(5)He often writes the words “best wishes” at the end of his letters. (改为被动语态)
The words “best wishes”____  often____ by him at the end of his letters.