I was writing a letter when my mother got home. (对划线部分提问)
___________ ___________ you doing when your mother got home?
Could you give the book back to the school library tomorrow? (改为同义句)
Could you __________ the book __________ the school library tomorrow?
“Are you mad at your sister?” Mary said to me. （改为间接引语）
Mary asked me ___________ I _____________ mad at my sister.
当我们遇到麻烦时，我们应该向警察寻求帮助。（完成译句）
We should             the police             help when we are in trouble.