句型转换。(每空1分，共10分)
根据所给提示，完成句型转换。每空一词，含缩略词。
This dress cost her 100 dollars. (改为否定句)
This dress ________  ________ her 100 dollars.
His father will be back next week. (对划线部分提问)
________  _______ his father be back ?
Students shouldn’t wear earrings at school. (改为被动语态)
Earrings shouldn't  _______  _______ by students at school.
Mike likes taking a bus to work. He likes taking an underground to work better. (合并为一句)
Mike ________ taking an underground _________ taking a bus to work.
她奶奶习惯于晚饭后散步。
Her grandmother ________ used to ________  a walk after supper.