句型转换 按括号内的要求转换下列句型，每空填一词。
Writing a good book is difficult . (改为同义句)
It’s difficult  _______ _________ a good book .
We can’t live if there is no air or water. (改为简单句)
We can’t live  ________ air __________ water.
The train will leave here in fifty minutes. (对划线部分提问)
_______ _________ will the train leave ?
What does “ success” mean?(同义句)
What is the______ _______ “ success” ?
Miss Black never gets angry with her students . (改为反义疑问句)
Miss Black never gets angry with her students, ________  ________?