请根据要求改写下列句子，每空一词。
Coaches came into use in 1958.        (对划线部分提问)
__________ __________ coaches come into use?
He is so energetic that he can be our leader. (改为简单句)
He is energetic __________ __________ be our leader.
“Have you finished the report?” I asked him. (改为间接引语)
I asked him __________ __________ had finished the report.
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.
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.