按要求转换下列句式，每空一词。
1.I was shopping when the UFO arrived.(对划线部分提问)
_________ _________ you _________ when the UFO arrived?
2.My Math teacher said,"You are hard-working."(改为间接引语)
My Math teacher said _________ _________ hard-working.
3.You shouldn't speak loudly in the dining room.(改为祈使句)
_________ _________ loudly in the dining room.
4.They got home after ten o'clock last night.(改为同义句)
They _________ get home _________ ten o'clock last night.
5.The alien was buying a souvenir.The girl called the police.(改为复合句)
_________ the alien was buying a souvenir,the girl called the police.
