按要求改写句子，每空格限填一词。
It took me half and hour to do the exercises ?（对划线部分提问）
_______ _______ did it take you to do the exercises?
We'll ask him to come down for dinner.（对划线部分提问）
______ shall we ask him to ______ ?
Jane bought some bread in the supermarket.（改为反意疑问句）
Jane bought some bread in the supermarket, ______ ______ ?
He got some bad marks in maths.（改为一般疑问句）
______ he get ______ bad marks in maths?
Liu Jun is good at English and P.E.（保持原意不变）
Liu Jun ______ ______ ______ English and P.E.
He studies very hard. He wanted to get good marks.（合并成一句）
He studies very hard ______ ______ ______ get good marks.
He has never read this novel.（改成反意疑问句）
He has never read this novel, ______ he?
Wang Gang couldn't win the first prize in the contest.（保持原
意不变）
Wang Gang ______ ______ ______ win the first prize.