按每小题后的要求转换下面的句子；每空一词。（每小题1分；满分5分）
Lucy will leave for London on business in three hours. （对划线部分提问）
________ ________ will Lucy leave for London on business?
The fashion show is successful. （改为感叹句）
______ ________ the fashion show is!
The teacher has told us how we should improve our speaking skills. （改为简单句）
The teacher has told us how ________ ________our speaking skills.
The boys were too tired to walk on. （改为同义句）
The boys were ________ tired ________ they couldn't walk on.
Mr. Brown and his wife have been married for 20 years.（改为同义句）
Mr. Brown and his wife ___________ ___________ 20 years ago.